# Shared Flashcard Set

## Details

Test 3
ch 5 6
98
Physics
10/13/2011

Term
 A rock weighs 30N on Earth. A second rock weighs 30N on the moon. Which of the two rocks has the greater mass?
Definition
 The one on the moon.
Term
 A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is:
Definition
 10 times as much
Term
 you are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. what force caused you to move forward?
Definition
 no forces were responsible for you suddenly moving forward.
Term
 which has zero acceleration? An object:
Definition
 moving at constant velocity at rest in mechanical equilibrium
Term
 a child pulls a wagon with a force of 75N. If the wagon moves a total of 42m in 1.8min., what is the average power generated by the child, in watts?
Definition
 29 W
Term
 which has the greater kinetic energy, a car traveling at 30km/hr or a car of half the mass traveling at 60km/hr?
Definition
 the 60 km/hr car
Term
 if the net work done on an object is negative, then the objects kinetic energy
Definition
 Decreases
Term
 a baseball outfielder throws a baseball of mass 0.15kg at a speed of 40m/s and initial angle of 30. what is the kinetic energy of the baseball at the highest point of the trajectory? ignore friction
Definition
 90 J
Term
 if you jumped out of a plane, you would begin speeding up as you fall downward. eventually, due to wind resistance, your velocity would become constant with time. after this occurs, the magnitude of the force of wind resistance is
Definition
 equal to the force of gravity acting on you
Term
 a girl and her bicycle have a total mass of 40kg. at the top of the hill her speed is 5.0m/s, and her speed doubles as she rides down the hill. the hill is 10m high and 100m long. how much mechanical energy is lost to friction?
Definition
 2420 J
Term
 A 10kg mass is placed on a 25* incline and friction keeps it from sliding the coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. what is the frictional force in the situation?
Definition
 41.4N
Term
 An 10kg object undergoes an acceleration of 2.8 m/sxs when a certain net force is applied to it. if that same net force is applied to a 9.0kg object, what acceleration is produced?
Definition
 3.1 m/sxs
Term
 a 6.0g bullet leaves the muzzle of a rifle with a speed of 314 m/s. what force (assumed constant) is the exerted on the bullet while it is traveling down the 0.78m long barrel of the rifle?
Definition
 379N
Term
 A 21kg box is placed atop a postal scale sitting on the floor of an elevator. if the elevator accelerates upward at 2m/sxs, what weight will the scale read?
Definition
 248 N
Term
 a shopper in a supermarket pushes a cart with a force of 25 N directed at an angle of 25* downward from the horizontal. find the work done by the shopper as she moves down a 56m length of aisle. ignore friction
Definition
 1270 J
Term
 A 7kg bowling ball moves at 2.5m/s. how fast must a 2g ping-pong ball move that is the two balls have the same kinetic energy?
Definition
 148 m/s
Term
 find the height from which you would have to drop a ball so that it would have a speed of 6m/s just before it hits the ground.
Definition
 1.84 m
Term
 the SI units for k, the spring constant, are equivalent to
Definition
 kg/ sxs
Term
 a Hooke's law spring is compressd a distance d and is used to launch a mass m vertically to a height h above its starting position. Under double the compression, the spring is now used to launch the mass. how high does the mass now rise above its starting position?
Definition
 4h
Term
Definition
 the gravitational attraction force between you and the earth.
Term
 a 10kg brick and a 1kg book are dropped in a vacuum. the force of gravity on the 10kg brick is
Definition
 10 times as much
Term
 a rock thrown vertically into the air. at the top of its path, its acceleration in meters per second per second is
Definition
 9.8
Term
 the brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
Definition
 the same
Term
 arnold strongman and suzie small each pull very hard on opposite ends of a massless rope in a tug-of-war. the greater force on the rope is exerted by
Definition
 both the same
Term
 a mack truck and a volkswagen traveling at the same speed have head-on collision. the vehicle that undergoes the greatest change in velocity will be the
Definition
 volkswagon
Term
 a job is done slowly, while an identical job is done quickly. both jobs require the same amount of work, but different amounts of
Definition
 power
Term
 a car moves 4 times as fast as another identical car. compared to the slower car, the faster car has
Definition
 16 times the KE
Term
 which requires the most amount of work by the breaks of a car? slowing down from 70km/h to a stop slowing down from 100km/h to 70 km/h equal amounts for either
Definition
 slowing down from 100km/h to 70km/h
Term
 two identical arrows, one with twice the speed of the other, are fired into a hay bale. the faster arrow will penetrate
Definition
 four times as far as the slower arrow
Term
 a 10kg object undergoes an acceleration of 2.8m/sxs when a certain net force is applied to it if that same net force is applied to a 9kg object, what acceleration is produced?
Definition
 3.1 m/sxs
Term
 a 21 kg box is placed atop a postal scale sitting on the floor of an elevator. if the elevator accelerates upward at 2m/sxs, what weight will the scale read?
Definition
 248 N
Term
 a shopper in a supermarket pushes a cart with a force of 25 N directed at a angle of 25* downward from the horizontal. find the work done by the shopper as she moves down from 56m length of aisle
Definition
 1270 J
Term
 the SI units for k, the spring constant, are equivalent to
Definition
 kg/ sxs
Term
 a Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height of h above its starting position. under double the compression, the spring is now used to launch the mass. how high does the mass now rise about the starting position?
Definition
 4 h
Term
Definition
 the gravitational attraction force between you and the earth
Term
 a 10kg brick and a 1kg book are dropped into a vacuum. the force of gravity on the 10kg brick is
Definition
 10 times as much
Term
 the breaks of a speeding truck are slammed on and it skids to a stop. if the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
Definition
 the same
Term
 arnold strongman and suzie small each pull very hard on opposite ends of a massless rope in a tug-of-war. the greater force on the rope is exerted by
Definition
 both the same
Term
 a job is done slowly while an identical job is done quickly. both jobs require the same amount of work, but different amounts of
Definition
 power
Term
 a car moves 4 times as fast as another identical car. compared to the slower car, the faster car has
Definition
 16 times the KE
Term
 which requires the most amount of work slowing down from 100km/h to 70km/h slowing down from 70km/h to a stop equal amounts for either
Definition
 slowing down from 100km/h to 70km/h
Term
 two identical arrows, one with twice the speed of the other, are fired into a hay bale. the faster arrow will penetrate
Definition
 four times as far as the slower arrow
Term
 the rate a which work is done is equivalent to
Definition
 power
Term
 a baseball outfielder throws a baseball of mass .15kg at a speed of 40m/s and initial angle of 30. what is the kinetic energy of the baseball at the highest point of the trajectory? ignore air friction
Definition
 90 J
Term
 a woman carries a heavy box across a room at a constant speed. how much work does she do on the box while walking?
Definition
 NONE
Term
 if both mass and velocity of a ball are tripled, the kinetic energy is increased by a factor of
Definition
 27
Term
 a car travels twice as fast as another when breaking to a stop will skid
Definition
 four times as far
Term
 a 10kg brick and a 1kg book are dropped in a vacuum. the force of gravity on the 10kg brick is
Definition
 10 times as much
Term
 if you jumped out of a plane, you would begin speeding up as you fall downward. eventually due to wind resistance, your velocity would become constant with time. after this occurs, the magnitude of the force of wind resistance is
Definition
 equal to the force of gravity acting on you
Term
 if a non-rotaing object has no acceleration, then we can say for certain that it is
Definition
 in mechanical equilibrium
Term
 a child pulls on a wagon handle at an angle of 37* above the horizontal with a force of 45N. if the wagon accelerates at 8.1 m/sxs horizontally, what is the mass of the wagon? assume frictional
Definition
 4.4 kg
Term
 a 100kg box is placed on a ramp. as one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15*. what is the coefficient of static friction between the box and ramp?
Definition
 0.27
Term
 if the net work done on an object is positive, then the objects kinetic energy
Definition
 increases
Term
 two blocks are released from the top of a building. one falls straight down while the other slides down a smooth ramp. if all friction is ignored, which one is moving faster when it reaches the bottom?
Definition
 they both will have the same speed
Term
 a block starts from rest at the top of a 31* inclined plane and encounters a spring, of constant 3.4kN/m, rigidly attached to the lane. if the blocks mass is 33kg and it compresses the spring by 37cm, find the distance the block travelled before it encountered the spring
Definition
 1.0 m
Term
 a rock weighs 30N on earth, a second rock weighs 30N on the moon, which of the two rocks has the greater mass
Definition
 the one on the moon
Term
 a car on a roller coaster starts at zero speed at an elevation above the ground of 26m. it coasts down a slope, and then climbs a hill. the top of the hill is at an elevation of 16m. what is the speed of the car at the top of the hill? neglect any frictional effects
Definition
 14m/s
Term
 you are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. what force caused you to move forward?
Definition
 no forces were responsible for you moving forward with respect to the bus
Term
 a massless spring hangs from the ceiling. how much does its potential energy increase, if a 28.8kg mass is attached to it? the spring constant is 4800N/m.
Definition
 8.3 J
Term
 how many Joules of energy are in one kilowatt-hour?
Definition
 3.6 million
Term
 the SI units for k, the spring constant, are equivalent to
Definition
 kg/sxs
Term
 a spring compressed a distance d and is used to launch a mass m vertically to a height h about its starting position. under double the compression, the spring is now used to launch the mass. how high does the mass now rise above its starting position?
Definition
 4h
Term
 a rock weighs 30N on earth. a second rock weighs 30N on the moon. which of the two rocks has the greater mass?
Definition
 the one on the moon
Term
 if one object has twice as much mass as the another object, it also has twice as much
Definition
 gravitational force acting on it and acceleration due to gravity
Term
 you drop a 60g golf ball from 2m high. it rebounds to 1.5m. how much energy is lost to heating and sound productin?
Definition
 .29 J
Term
 a rubber box sits on a platform that is slowly tilted until the box slides down the incline. if the box ends up sliding down the incline when the tilt angle hits 41 degrees, what is the coefficeint of static friction between the box and incline?
Definition
 0.87
Term
 you hold a 2N eraser against a chalkboard by placing it between your finger and the vertical chalkboard surface. assuming the coefficient of friction between your finger and the eraser is the same as the coefficient of friction between the eraser and calkboard (lets say its .6) what is the minimum amount of force you need to apply on the eraser perpendicular to the chalkboard to prevent it from falling?
Definition
 1.7N
Term
 a 21kg box is placed atop a postal scale sitting on the floor of an elevator. if the scale reads 164N, how fast is the elevator accelerating?
Definition
 1.99m/sxs
Term
 a jet airliner traveling at 600km/hr strikes an unfortunate bird flying at 20km/hr and splatters it. the force of impact is
Definition
 the same for both
Term
 if an 18-wheeler and a toyota corolla(small passenger car) have a head-on collision, which vehicle will experience the greater change in velocity?
Definition
 toyota corolla
Term
 a gun fires a bullet. does the gun or bullet experience a greater force, and which of Newtons 3 laws explains this fact?
Definition
 the gun and the bullet experience the same force as a consequence of Newtons 3rd law
Term
 a piece of rope is pulled by two people in a tug-of-war. each pulls with 400N of force. what is the tension in the rope?
Definition
 400N
Term
 a child pulls on a wagon handle at an angle of 37* above the horizontal with a force of 45N. if the wagon accelerates at 8.1m/sxs horizontally, what is the mass of the wagon? ignore friction
Definition
 4.4kg
Term
 as a car drives with its tires rolling without any slippage, the type of friction acting between the tires and the road is
Definition
 static friction
Term
 a 16kg fish is weighed with two spring scales, each negligible weight. what will the readings on the scale be?
Definition
 the sum of the two readings will be 32kg
Term
 which of the following represents an action/reaction pair?
Definition
 the force of shoes pushing on the ground and the force of the ground pushing back on the shoes as a person is in the process of jumping
Term
 the force exerted on the tires of a car to directly accelerate it along a road is exerted by the
Definition
Term
 a 10kg brick and a 1kg book are dropped in a vacuum. the force of gravity on the 10kg brick is
Definition
 10times as much
Term
 a rock weighs 30N on earth. a second rock weighs 30N on the moon. which of the two rocks has the greater mass
Definition
 the one on the moon
Term
 the SI units for k, the spring constant, are equivalent to
Definition
 kg/sxs
Term
 is it possible for a system to have negative potential energy
Definition
 YES, since the choice of the zero of potential energy is arbitrary
Term
 a 21kg box is placed atop a postal scale sitting on the floor of an elevator. if the scale reads 323N, how fast is the elevator accelerating?
Definition
 5.58 m/sxs
Term
 a spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position. under double the compression, the spring is now used to launch the mass. how high does the mass now rise above the starting position?
Definition
 4h
Term
 a rubber box sits on a platform that is slowly tilted until the box slides down the incline. if the box ends up sliding down the incline when the tilt angle (with respect to the ground) hits 45*, what is the coefficient of static friction between the box and incline?
Definition
 1
Term
 you hold a 2N eraser against the chalkboard by placing it between your finder and the vertical chalkboard surface. assuming the coefficient of friction between your finger and the eraser is the same as the coefficient of friction between the eraser and the chalkboard (lets say its .6) what is the minimum amount of force you need to apply on the eraser perpendicular to the chalkboard to prevent it from falling?
Definition
 1.7N
Term
 you drop a 60g golf ball from 2m high. it rebounds to 1.5m. how much energy is lost to heating and sound production?
Definition
 .29 J
Term
 if one object has twice as much mass as another object, it also has twice as much
Definition
 intertia
Term
 a car traveling at 100km/hr strikes an unfortunate bug and splatters it. the force of impact is
Definition
 the same for both
Term
 how many Joules of energy are in one kilowatt-hour?
Definition
 3.6 million
Term
 a 21kg box is placed atop a postal scale sitting on the floor of an elevator. if the scale reads 323N, how fast is the elevator accelerating?
Definition
 5.58m/sxs
Term
 jason takes off across level water on his jet-powered skis. the combined mass of jason and skis is 75kg. the skis have a thrust of 200N and a coefficient of kinetic friction on water of 0.10. Unfortunately, the skis run out of fuel after only 11s. what is jason's top speed?
Definition
 11m/s
Term
 you are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. what force caused you to move forward?
Definition
 no forces were responsible for you suddenly moving forward
Term
 a rock weighs 30N on the earth. another rock weighs 30N on the moon. which of the two rocks has a greater mass
Definition
 the one on the moon
Term
 a 2N force is applied horizontally on a book that weighs 20N that is resting on a tabletop. if Mu s=.5 between book and table, find the force of static friction on the book
Definition
 9.8 N
Term
 a child pulls a wagon handle at an angle of 37* above the horizontal with a force of 45 N. If the wagon accelerates at 6.4 m/sxs horzontally, what is the mass of the wagon?
Definition
 7kg
Term
 a jet airliner traveling at 600km/hr strikes an unfortunate bird flying at 20km/hr and splatters it. the force of impact is
Definition
 the same for both
Term
 a 10kg brick and a 1kg book are dropped in a vacuum. the force of gravity on the 10 kg brick is
Definition
 10 times as much
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