# Shared Flashcard Set

## Details

Physics sem. 1 final
physics
141
Physics
01/17/2013

Term
 an object in mechanical equilibrium is an object...
Definition
 at rest, moving with constant velocity, and having no acceleration
Term
 when you stand at rest on a pair of bathroom scales, the readings on the scales will always..
Definition
Term
 a man weighing 800 N stands at rest on two bathroom scaled so that his weight is distributed evenly over both scales. the reading on each scale is...
Definition
 400 n
Term
 the force of friction on a sliding object is 10 n. the applied force needed to maintain a constant velocity is..
Definition
 10 N
Term
 a package falls off a truck that is moving at 30m/s. neglecting the air resistance, the horizontal speed of the package just before it hits the ground is...
Definition
Term
 if your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. the concept that most explains why is...
Definition
 interia
Term
 according to newtons law of inertia, a railroad train in motion should continue going forever, even if its engine is turned off. we never observe this, because railroad trains...
Definition
 always has forces hat oppose their motion
Term
 whirl a rock at the end of a string and it follows a circular path. if the string breaks the tendency of the rock is to...
Definition
Term
 if no external forces are acting, on a moving object, it will..
Definition
 continue moving at the same velocity
Term
 two measurements necessary for calculating average speed are...
Definition
 distance and time
Term
 a car maintains a constant velocity of 100 km/hr during this interval, its acceleration is...
Definition
 zero.
Term
 while an object near the earths surface is in freefall its...
Definition
 velocity increases
Term
 an object at rest near the surface of a distant planet starts the fall freely if the acceleration there is twice that of the earths, its speed one second later, would be...
Definition
 40m/s
Term
 if an object falling freely from somehow equipped with an odometer to measure the distance it travels then tha amount of distance it travels each succeeding second it travels would be...
Definition
 grater than the second before
Term
 if a freely falling object were somehow equipped with a speedometer its speed reading would increase each second by..
Definition
Term
 if a car increases it velocity form zero to 60 km/h in 10 secs its acceleration is...
Definition
 6km/h/s
Term
 if a rocket initially at rest accelerates at a rate of 50m/s2 for a minute, its speed will be what?
Definition
 3000 m/s
Term
 it takes 6 seconds for a stone to fall to the bottom of a mine shaft, how deep is the shaft?
Definition
Term
 in each second of fall, the distance a freely falling object will fall is..
Definition
 increasing
Term
 a ball tossed vertically upward rises reaches its highest point and then falls back to its starting point, during this time the acceleration of the ball is always...
Definition
 directed downward
Term
 while a car travels around a circular track at a constant speed, its...
Definition
 none of the above
Term
 a ball is thrown upwards and returns to the same position. compared with its original speed after release its speed when it returns, is about..
Definition
 the same
Term
 at one instant an object in free fall is moving downward at 50 m/s, 1 second later, its speed should be about..
Definition
 60 m/s
Term
 at one instant a heavy object in the air is moving upward, at 50 m/s. 1 second later, its speed is approximetaley ...
Definition
 40 m/s
Term
 disregarding air resistance, objects fall with constant...
Definition
 acceleration
Term
 a ball is thrown upwards and caught when it comes back down. in the presences of air resistance the speed with which it is caught, is always...
Definition
 less than the speed it had when thrown upwards.
Term
 if you drop an object, it will accelerate downward at the rate of 9.8m/s. if you instead throw it downwards, its acceleration (in the absence of air resistance) will be..
Definition
 9.8 m/s/s
Term
 if a projectile is fired straight up at the speed of 10 m/s, the time it takes to reach the top of its path is..
Definition
 1 second
Term
 if a projectile is fired straight up at the speed of 10 m/s the time to rturn to its starting position is about,
Definition
 2 seconds
Term
 consider drops of water that lead to a stead rate, form a dipping faucet. as the drops fall, they
Definition
 get furthter apart
Term
 a car accelerates from rest for 5 seconds, until it reaches a speed of 20 m/s. what is the cars acceleration in m/s/s?
Definition
 4
Term
 when a rock thrown straight upwards gets to the exact top of its path, its..
Definition
 velocity is zero, and acceleration is about 10m/s/s
Term
 a kilogram is a measurment of a objects..
Definition
 mass
Term
 compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much
Definition
 inertia, mass, and volume
Term
Definition
 the gravitational attraction force between you and the earth.
Term
 if one object has twice as much mass as another object it also as twice as much...
Definition
 inertia
Term
 compared to the mass of a certain object on earth, the mass of the same object on the moon is..
Definition
 the same
Term
 a newton is a unit of...
Definition
 force
Term
 a force is a vector quantity because it has both...
Definition
 magnitude and direction.
Term
 an object is propelled along a straight line path by a force if the net force were doubled, the objects acceleration would be...
Definition
 twice as much
Term
 an object is pulled northward by a force of 10 N and at the same time, another force of 15 N pulls it southward, the magnitude of the resultant force on the object is...
Definition
 5 N
Term
 the force of friction on a sliding object is 10 N the applied force to maintain constant velocity is..
Definition
 10 N
Term
 which has zero acceleration? an object....
Definition
 at rest, moving at constant velocity, in mechanical equillibrium.
Term
 a 1-kg mass at the end of earths surface weighs...
Definition
 9.8 n
Term
 hang a pair of gym rings, and the upward support forces of he rings, will always
Definition
Term
 a car has a mass of 1000- kilograms, and accelerates at 2m/s/s. what is the magnitude of the net force exherted on the car?
Definition
 2000 N
Term
 a tow truck exerts a force of 3000N on a car. accelerating it at 2m/s/s. what is the mass of the car?
Definition
 15 kg
Term
 if the mass of an object does not change, a constant net force on the object produces constant...
Definition
 acceleration
Term
 an object following a straight line path at constant speed....
Definition
 has zero acceleration
Term
 neglecting friction a large block of ice and a small block of ice start sliding down an incline together.. the heavier block will get to the bottom....
Definition
 at the same time as the light block
Term
 na rocket becomes progressively easier to accelerate as it travels upward from the ground, mainly because...
Definition
 the mass of the rocket decreases as fuel is burned.
Term
 a rocket is thrown vertically into the air. at the very top of it trajectory the net force on it is...
Definition
 equal to its weight.
Term
 a block is dragged without acceleration in a straight line path across a level surface by a force of 6 N. what is the force of friction between the block and the surface?
Definition
 6 N
Term
 suppose a particle i being accelerated threw space by a 10 N force. suddenly, the particle encounters a second force of 10 N in the opposite direction from the first force. the particle with both forces acting on it...
Definition
 continues at the speed it had when it encountered the second force
Term
 a skydiver of mass 100-kg experiences air resistance of 500N, and an acceleration of..
Definition
Term
 a car traveling at 22m/s comes to an abrupt hualt in 0.1 second when it hits a tree. what is the decelleration in m/s/s of the car?
Definition
 220m/s/s
Term
 if less horizontal force is applied to a sliding object then is needed to maintain a constant velocity...
Definition
 the object eventually slides to a stop.
Term
 two factors that greatly affect air resistance on falling objects are the...
Definition
 size and speed of the object.
Term
 when a falling object has reached its terminal velocity, its accelertion is...
Definition
 zero.
Term
 a skydiver jumps form a high flying plane. as her velocity of fall increases, her acceleration..
Definition
 decreases
Term
 a skydiver terminal velocity will be greatest if he falls...
Definition
Term
 for an action force, there but be a reaction force that...
Definition
 is exactly equal in magnitude.
Term
 an archer shoots an arrow. consider the action force to be the bow string against the arrow. the reaction to the force is...
Definition
 arrows push against the bow string.
Term
 a person is attracted to the center of the earth by 500-N gravitational force. the earth is attracted toward the person with a froce of...
Definition
 500N
Term
 a mack truck and a volkswagen traveling at the same speed have a head on collision. the vehicle that undergoes the greatest change in velocity will be the...
Definition
 volkswagen
Term
 two people, one twice as massive as the other, attempt a tug of war, with 12 meters of mass-less rope on a friction-less ice. after a brief time they meet. the heavier person slides the distance of...
Definition
 4 meters.
Term
 which of the following has the largest momentum? relative to the earhts surface..
Definition
 a pick up truck speeding along a highway.
Term
 a freight train rolls along a track, with considerable momentum. if it rolls at the same speed, but has twice as much mass, its momentum is...
Definition
Term
 a rifle recoils while firing a bullet, the peed of the rifles recoil is...
Definition
 small because the rifle has much more mass than the bullet.
Term
 to catch a ball, a baseball player extends the hand froward before impact with the ball an then lets it ride backward in the direction of the balls motion, doing this reduces the force of impact of the players hand principaly because the...
Definition
 time of impact is increased.
Term
 when you jump form an elevated position you usually bend your knees upon reaching the ground. by dowing this, you make the time of impact about ten times as great as for a stiff legged landing, in this way the average force, your body experinces is..
Definition
Term
 a heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. compared to the force that stops the car, the force is needed to stop the truck is..
Definition
 greater.
Term
 a karate expert breaks a cement block with her bear hand. the magnitude of the force exerted by her hand is...
Definition
 identical to the force applied to the block.
Term
 the force that accelerates a rocket into outer space, is exerted on the rocket by the..
Definition
 exhaust gases.
Term
 two billiard balls having the same mass and speed, roll towards eachother, what is their combined momentum after they meet?
Definition
 zero.
Term
 a large metal ball is shot form a cannon, with a short barrel, if the small ball were to be shot from the canon with a longer barrell, its muzzel velocity would be
Definition
 more
Term
 your driving down the highway and a bug splatters onto your windsheild. which undergoes the greater change in momentum druing the time of contact?
Definition
 both the same.
Term
 an astronaut, floating along in outer space throws a bseball, if the ball floats aay at the speed of 20 m/s. the atronuat will...
Definition
 move in the opposite direction butin a lower speed..
Term
 the change in momentum in kg m/s that occurs when a 1.0 kg ball traveling at 4 m/s strikes a wall and bounces back at 2.0 m/s is.
Definition
 6
Term
 if you push a half an hour or a whole hour against a sationary wall....
Definition
 no work on the wall is done in either case.
Term
 if you find that twice as much work is needed to perform a task but it takes twice as much time..the amount of power required is..
Definition
 unchanged
Term
 if you do work on an obect in 1/3rd the usual time, our power output is..
Definition
 3 times the usual power output.
Term
 if the object is raised twice as high, its potential energy will be..
Definition
 twice as much
Term
 a one thousand kilogram car and a 2000 kg car are hoisted the same distance. raising the more massive car requires...
Definition
 twice as much work.
Term
 an obect that has kinetic energy, must be...
Definition
 moving
Term
 an object may have potential energy because of its...
Definition
 location.
Term
 a bow is drawn so that it has 40 J of potential energy. when fired, the arrow will idealy have a kinetic energy that is...
Definition
 40 j
Term
 when an automobile is breaked to a stop, its kinetic energy is transformed to...
Definition
 heat
Term
 a ball rolling down a incline has its maximum potential energy at...
Definition
 the top
Term
 a ball roling down an incline has it maximum kinetic energy at,
Definition
 the bottom
Term
 what task requries the most work? lifting a 50 kg sack, 2 meters, or lifting a 25 kg sack, 4 meters
Definition
 both the same
Term
 both a 50 kg sack if lifting 2 meters from the ground and 2 kg sack is lifted 4 meters in the same time.. the power expanded in raising the 50 kg sack is...
Definition
 the same
Term
 a tv set is pushed a distance of 2 meters, with a force of 20 N. how much work is done on the set?
Definition
 40 J
Term
 it tkes 40 j to push a large box, 4 meters across a floor, assuming the push is in the same direction as the move, what is the magnitude of the force on the box?
Definition
 10 N
Term
 a two kg mass is held 4 meters above he ground, what is teh approximate potentil eergy of the mass with respect to the ground?
Definition
 80 J
Term
 using one thousnad jouls of work, a toy elevator is raised, from the ground floor, to the second floorin 20 seconds, the power needed to do this job was?
Definition
 50 watts
Term
 to in]dentical arrows, one with twice the kinetic energy as the other, are fired into a haybail, the faster arrow will penetrate?
Definition
 twice as far as the slower arrow.
Term
 a car moves four times as fast as another identical car. compared to the slower car, the faster car has...
Definition
 16 times the KE
Term
 a ball is projected into the air with 100j of kinetic energy, which is transformed to gravitational potential energy at the top of its trajectory. when it returns to its original level after encountering air resistance, its kinetic energy is...
Definition
 less than 100j
Term
 a machine puts out 100 watts, for power fr every 1000 watts put into it. the efficency of the machine is?
Definition
 10%
Term
 newton discovered?
Definition
 that gravity is universal
Term
 accoridng to newton, the greater the masses of interacting objects, the..
Definition
 greater the gravitational force between them
Term
 accoriding to newton,doubling the distance between two interacting objects....
Definition
 divides by 4 he gravitational force between them.
Term
 inside a freely falling elevator, there would be no..?
Definition
 apparent weight for you.
Term
 the earths gravitationl feild extends...?
Definition
 both inside and outside the earth and throughout the entire universe.
Term
 a black hole is..?
Definition
 remains of a giant star.
Term
 an object is placed exactly between the earth and the moon, the object will fall toward the..
Definition
 earth
Term
 the amount of gravitational force that acts on the space shuttle while in orbit is...
Definition
 almost as much as the shuttles weight on the sureface
Term
 a very massive object A and a less massive object B move torward eachother under the influence of gravitation. which force, if either, if greater?
Definition
 both the same
Term
 two object move toward eachother because of gravity, as the objects get closer and closer the force between them....
Definition
 increases
Term
 two objects move toward eachother becasue of gravity, as the objects get closer and closer, the acceleration of each..
Definition
 increase
Term
 passengers in a highflying jet fill their normal weight in flight, while passengers, in an orbiting space shutle do not. this is because passegers in shuttles are...
Definition
 without support forces.
Term
 no force due to the earths gravity is acting on the astronauts inside the orbiting space shuttle. this statement is..
Definition
 always false
Term
 the reason the moon does not crash into the earth is that..
Definition
 the moon has a significant tangable speed.
Term
 the factor most directly responsible for making a balck hole invisible is its...
Definition
 surface escape velocity.
Term
 if the sun collapsed to a black hole, the earths gravitational attraction, to it would b...
Definition
 the same
Term
 how far must one travel to get away from the earths grvitational field?
Definition
 to a region beyond the solar system.
Term
 the main reason ocean tides exhist is that the pull of the moon...
Definition
 is greater on the oceans closer to the moon than oceans further from the moon.
Term
 suppose the moon had twice as much mass as it now does, and still orbited the earth at the same distance..in that case, the ocean bugkes on earth would be..
Definition
 larger
Term
 accordng to keplers laws, the path of planets about the sun are,
Definition
 ellipses
Term
 a rock is thrown upward at 50 degrees, with respect to the horizontal. as it rises, neglecting air drag, its vertical component of velocity....
Definition
 decreases
Term
 a rock is thorwn upward at 50degrees with respect, to the horizontal as it rises neglecting air drag its horizontal component of velocity..
Definition
 stays the same
Term
 a stone is thrown, horizontaly from the top of a cliff, one second after it has left your hand, its vertical distance below the top of the clif s...
Definition
 5 meters
Term
 throw an object pward at a 45 degree angle, with no gravity it will folow a straight line path. butbecaue of gravirty, at the end of the second it is..
Definition
 about 5 meters below the straight line.
Term
 roll a bowling ball off the ledge of a table, as it falls, its hoizontal component of velocity..
Definition
 remians constant
Term
 a bullet fired horizontally from a rifle begins to fall..
Definition
 as soon as it leaves the barrell
Term
 a projectile is launched verticaly upward 50 m/s. if air resitance is negligible its speed upon returning to its starting point is..
Definition
 50 /s
Term
 an earth satellite is simply a projectile...
Definition
 freely falling aorund the earth
Term
 earth satellites are 100 km high. so as to be above the earths,
Definition
 atmosphere
Term
 a hunter on level ground fires a bullet at the angle of 10 degrees, above the horizontal, while simuetaneously droping. another bullet fromm the level of the rifle, which bullet will hit the gorund first?
Definition
 dropping one.
Term
 an object is dropping and freely falls to the ground with an accleration of 1 g. if it is thrown upward at an angle, instead its accl. will be what?
Definition
 1g downward
Term
 a projectile is launched at grond level, and angled at 15 degrees, above the horiz. and lands downrange..
Definition
 at 75 degrees.
Term
 two projectiles are fired form ground level at equal speeds, but diff, angles, one is fired at 30 d and the other at 60 d. the projectile to hit the ground first, will be the one fired at (no air resistance)..
Definition
 30 degrees.
Term
 the groundspeed of an airplane thathas an air speed of 200km/h when it is in a 200 km/h cross wind, is..
Definition
 283km/h
Term
 the tangentile velocity, of an earth satlellite, is its velocity...?
Definition
 parrell to the earth
Term
 the radial velocity of an earths satelittle is its velocity...
Definition
 perpendicular to the surface of the earth
Term
 planets would crash inot the sun if it werent for?
Definition
 their tangentile velocities..
Term
 circular path of a saletlite orbitting the erth is caracteriszed by a contnt
Definition
Term
 satelilltes travel fatest when...
Definition
 nearest to the earth.
Term
 speeds of the planet abiut the sun, depends on..
Definition
 their distance from the sun.
Term
 a vertical oriented rocket that is omehow able to maintain a continuous upward veocity of 8 km/s will...
Definition
 escape fromthe earth.
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