question

A

answer

Gravitational potential energy is...
A. mass times the acceleration due to gravity times vertical position.
B. velocity per unit mass.
C. the area under a gravity force-versus-time graph.
D. the gravitation constant times mass-squared divided by distance-squared.
C. 1/2 mass times speed-squared.

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3

answer

Mechanical energy is
1 the energy due to internal moving parts.
2 the energy of motion.
3 the sum of kinetic energy plus potential energy.
4 the energy of position.
5 the sum of kinetic, potential, thermal, and elastic energy.

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5

answer

For conservative forces, Force can be found as being the negative of the derivative of
1 kinetic energy.
2 momentum.
3 work.
4 impulse.
5 potential energy.

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B

answer

Rank in order, from largest to smallest, the gravitational potential energies of the balls.
A 1 > 2 = 4 > 3
B 3 > 2 = 4 > 1
C 3 > 2 > 4 > 1
D 1 > 2 > 3 > 4

question

3

answer

As the projectile goes upward, what energy changes take place?
1 Both kinetic and potential energy decrease.
2 Both kinetic and potential energy increase.
3 Kinetic energy decreases; potential energy increases.
4 Kinetic energy increases; potential energy decreases.

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4

answer

At the top point of the flight, what can be said about the projectile's kinetic and potential energy?
1 Both kinetic and potential energy are at their maximum values.
2 Both kinetic and potential energy are at their minimum values.
3 Kinetic energy is at a maximum; potential energy is at a minimum.
4 Kinetic energy is at a minimum; potential energy is at a maximum.

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4

answer

The potential energy of the object at the moment of launch __________.
1 is negative
2 is positive
3 is zero
4 depends on the choice of the "zero level" of potential energy

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3

answer

Suppose our experimenter repeats his experiment on a planet more massive than Earth, where the acceleration due to gravity is g=30 m/s2. When he releases the ball from chin height without giving it a push, how will the ball's behavior differ from its behavior on Earth?
1 It will take more time to return to the point from which it was released.
2 Its mass will be greater.
3 It will take less time to return to the point from which it was released.
4 It will smash his face.
5 It will stop well short of his face.

question

2

answer

The force acting on the particle at point A is __________.
1 directed to the right
2 directed to the left
3 equal to zero

question

1

answer

The force acting on the particle at point C is __________.
1 directed to the right
2 directed to the left
3 equal to zero

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3

answer

The force acting on the particle at point B is __________.
1 directed to the right
2 directed to the left
3 equal to zero

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3

answer

The acceleration of the particle at point B is __________.
1 directed to the right
2 directed to the left
3 equal to zero

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2

answer

If the particle is located slightly to the left of point B, its acceleration is __________.
1 directed to the right
2 directed to the left
3 equal to zero

question

1

answer

If the particle is located slightly to the right of point B, its acceleration is __________.
1 directed to the right
2 directed to the left
3 equal to zero

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BF

answer

Name all labeled points on the graph corresponding to unstable equilibrium.

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DH

answer

Name all labeled points on the graph corresponding to stable equilibrium.

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BDFH

answer

Name all labeled points on the graph where the acceleration of the particle is zero.

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AE

answer

Name all labeled points such that when a particle is released from rest there, it would accelerate to the left.

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A

answer

Consider points A, E, and G. Of these three points, which one corresponds to the greatest magnitude of acceleration of the particle?

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D

answer

What point on the graph corresponds to the maximum kinetic energy of the moving particle?

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B

answer

At what point on the graph does the particle have the lowest speed?

question

X

answer

At which of the three points labeled in the figure is the magnitude of the force on the particle greatest?

question

4

answer

Which, if any, of the following statements concerning the work done by a conservative force is NOT true?
1 It can always be expressed as the difference between the initial and final values of a potential energy function.
2 When the starting and ending points are the same, the total work is zero.
3 It is independent of the path of the body and depends only on the starting and ending points.
4 All of the above statements are true.

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N

answer

If the force on a particle at some point in space is zero, must its potential energy also be zero at that point? Y/N

question

N

answer

If the potential energy of a particle at some point in space is zero, must the force on it also be zero at that point? Y/N

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C

answer

A roller-coaster car rolls down a frictionless track, reaching speed v_0 at the bottom. If you want the car to go twice as fast at the bottom, by what factor must you increase the height of the track?
A You must increase the track height by a factor of 2.
B You must increase the track height by a factor of 3.
C You must increase the track height by a factor of 4.

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N

answer

Can kinetic energy ever be negative? Y/N

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Y

answer

Can gravitational potential energy ever be negative? Y/N

question

3

answer

Is it possible for a system to have negative potential energy?
1 Yes, as long as the total energy is positive.
2 No, because this would have no physical meaning.
3 Yes, since the choice of the zero of potential energy is arbitrary.
4 Yes, as long as the kinetic energy is positive.
5 No, because the kinetic energy of a system must equal its potential energy.

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2

answer

Upon what basic quantity does kinetic energy depend?
1 Position
2 Motion
3 Size
4 Force

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4

answer

Upon what basic quantity does potential energy depend?
1 Force
2 Size
3 Motion
4 Position

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1/4

answer

The same ball is shot straight up a second time from the same gun, but this time the spring is compressed only half as far before firing. How far up does the ball go this time?

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2

answer

The work-energy theorem states that a force acting on a particle as it moves over a ______ changes the ______ energy of the particle if the force has a component parallel to the motion.
1 distance / potential
2 distance / kinetic
3 vertical displacement / potential
4 none of the above

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3

answer

To calculate the change in kinetic energy, you must know the force as a function of _______. The work done by the force causes the kinetic energy change.
1 acceleration
2 work
3 position
4 potential energy

question

1

answer

To illustrate the work-energy concept, consider the case of a stone falling from x_i to x_f under the influence of gravity.
Using the work-energy concept, we say that work is done by the gravitational _____, resulting in an increase of the ______ energy of the stone.
1 force / kinetic
2 potential energy / potential
3 force / potential
4 potential energy / kinetic

question

3

answer

Rather than ascribing the increased kinetic energy of the stone to the work of gravity, we now (when using potential energy rather than work-energy) say that the increased kinetic energy comes from the ______ of the _______ energy.
1 work / potential
2 force / kinetic
3 change / potential

question

1

answer

This process happens in such a way that total mechanical energy, equal to the ______ of the kinetic and potential energies, is _______.
1 sum / conserved
2 sum / zero
3 sum / not conserved
4 difference / conserved