# Shared Flashcard Set

## Details

Midterm
Feinstein Midterm
50
Physics
01/18/2010

Term
 As an object falls freely in a vacuum (w/o air resistance) its
Definition
 velocity increases
Term
 In the absence of air resistance, the objects fall at a constant
Definition
 acceleration
Term
 A ball is thrown up and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be
Definition
 the same as the speed when first released
Term
 Suppose an object is in free fall. Each second the object falls
Definition
 a larger distance than the in the second before.
Term
 If you have drop a feather and coin in an air-filled tube, which hits the ground first?
Definition
 the coin
Term
 When a basketball player jumps to make a shot, once his feet are off the ground, the jumper's acceleration...
Definition
 is "g". No more or les
Term
 A ball is thrown straight up. The top of its path, the instantaneous speed is
Definition
 0 m/s
Term
 When something falls it accelerates. The acceleration is called the acceleration due to gravity and is symbolized by "g" and it is...
Definition
 9.8 m/s
Term
 If a free falling object were equipt with a speedometer, its speed reading would increase by about ___ seconds
Definition
 10
Term
 If a ball were equipt with a speedometer on a planet where the acceleration due to gravity is 23 m/s, the reading on the speedometer would increase each second by
Definition
 23 m/s
Term
 A freely falling object starts from rest and after falling for 6 seconds it will have a speed of about
Definition
 60 m/s
Term
 If you drop a feather and a coin in a vacuum tube which will reach the bottom first?
Definition
 neither- they will land at the same time
Term
 When you drop an object you can assume that the _________ of the object is zero when using kinematics equations.
Definition
 initial velocity
Term
 Acceleration is defined as a a change in
Definition
 velocity divided by time
Term
 Suppose that a car changes from 35 m/s to 40 m/s in one second and from 40m/s to 45 m/s in the second second... what is the accleration
Definition
 5 m/hxs
Term
 the horizontal component of a projectile's velocity is independent of
Definition
 the vertical component
Term
 a ball is launched horizontally in and hits the ground in .8 seconds. If it had been launched with a much higher speed in the same direction, it would have hit the ground in...
Definition
 .8 seconds
Term
 The time the projectile is in the air is called
Definition
 flight time
Term
 In the absence of air friction, the horizontal component of a projectile's velocity doesnt change as the projectile movesSometimes, Always, or Never true?
Definition
 Always true
Term
 A cannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 30 m/s. Ideally (no air resistance) the ball will land on the ground with a speed of
Definition
 30 m/s
Term
 In the absence of air friction, the vertical component of a projectile's velocity doesnt change as the projectile movessometimes, always, or never true?
Definition
 Always
Term
 What is an example of something that is not a projectile?
Definition
 a cannonball rolling down a hill
Term
 What angle produces the same distance as 75 degrees?
Definition
 15 degrees
Term
 the highest position the projectile reaches is known as its
Definition
 maximum height
Term
 A ball is thrown up into the air and at the top the velocity is entirely
Definition
 horizontal
Term
 At the instant a ball is thrown horizontally, another ball is dropped at the same height. Which ball hits the ground first?
Definition
 hits at the same time
Term
 A cannonball is launched horizontally from a tower. If the cannonball has a velocity of 60 m/s, where will it be in 1 second
Definition
 60 m down range
Term
 at what angle will the projectile go the furthest?
Definition
 45 degrees
Term
 At what part of the path does a projectile have a minimum speed?
Definition
 at the top of its path
Term
 the horizontal distance a projectile travels is also known as its
Definition
 range
Term
 If a projectile is launched at an angle the shape of its trajectory will look like a
Definition
 full parabola
Term
 The law of inertia state that an object
Definition
 -will continue moving unless acted upon-will continue moving in a straight line unless acted upon -will be at rest unless acted upon
Term
 the law of inertia applies
Definition
 to nonmoving and moving objects
Term
 a sheet of paper wont topple a container of milk because the milk carton has
Definition
 inertia
Term
 One object has twice as much mass as another and the first object also has twice as much
Definition
 inertia
Term
 Compared to its weight on earth, the WEIGHT of a 10 kg object on the moon will be
Definition
 less
Term
 Compared to its weight on earth, the MASS of a 10 kg object on the moon will be
Definition
 the same
Term
 the mass of a sheep that weighs 110N is (? kg)
Definition
 11 kg
Term
 An object following a straight-line path at a constant path at a constant speed has ___ acceleration
Definition
 zero
Term
 A girl whose weight is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand?
Definition
 250 N
Term
 Friction Force is a force that always acts
Definition
 opposite to an object's motion
Term
 Which has more mass a kg of feathers or a kg of iron
Definition
 both have the same
Term
 An object on Earth is 30 N and an object on the moon is 30 N. Which has the greater mass?
Definition
 moon one
Term
 When an object reaches terminal velocity, its acceleration is
Definition
 0 m/s
Term
 Suppose a force of friction of an object on a level surface is 25 N. The applied force needed to accelerate the object should be
Definition
 more than 25 N
Term
 A book weighs 4 . When held at rest in your hands, the net force on the book is
Definition
 0 N
Term
 An apple weighs 1 N. The Net Force (total force) on the apple when it is in free fall is
Definition
 1 N
Term
 If you pull horizontally on a desk with a force of 250 N causing the desk to move at a constant velocity, the friction force must be
Definition
 equal to 250 N
Term
 A Net Force on a cart doubles, what happens to its acceleration?
Definition
 It doubles too.
Term
 Net Force=
Definition
 total force
Supporting users have an ad free experience!