2. A ball (X) is kicked sideways (horizontally) off of a ledge, at height C, at the same time another identical ball (Y) is dropped from the same ledge. The floor below is level. When the second ball, Y, is a distance D above the floor, where is the first ball, X?
a. At the same height as D
b. Above D
c. Below D
d. The position of X would depend on how high D is.
e. None of the above.

3. For the problem above (#2), which ball reaches the ground first?
a. Ball X
b. Ball Y
c. The two balls reach the ground at the same time
d. It depends on how high C is
e. None of the above

4. For the above problem (#2), which ball reaches the ground with the greatest speed?
a. Ball X
b. Ball Y
c. The two balls reach the ground at the same speed
d. It depends on how C is
e. None of the above

5. A rocket is coasting in space sideways (left to right) from point A to point B. Between A and B, no outside forces act on the rocket. When it reaches point B, the rocket fires its engines (out the bottom) at a constant rate until it reaches a point C. At C, the rocket's engines are turned off. Which of the paths below will the rocket follow from B to C?

6. For the problem above (#5), as the rocket moves from B to C, its speed is
a. Constant
b. Continuously increasing
c. Continuously decreasing
d. Increasing for a while, and constant thereafter
e. Constant for a while, and decreasing thereafter

7. For the problem above (#5), at C, the rocket's engines are turned off. Which of the paths below will the rocket follow beyond C?


8. In the above problem (#7), the speed of the rocket as it moves beyond C is
a. Constant
b. Continuously increasing
c. Continuously decreasing
d. Increasing for a while, and constant thereafter
e. Constant for a while, and decreasing thereafter

Questions 9 through 16 are pulled from a set of questions.
Set for question 9:
A. With a quick pull, you can withdraw a sheet of paper from under a glass of water without spilling the water. This illustrates
a. Inertia b. weight c. acceleration d. the third law of motion
B. A moving object on which no forces are acting will continue to move with constant
a. acceleration b. impulse c. momentum d. velocity
C. Inertia is a measure of an object's
a. weight b. force c. mass d. gravity e. center of mass

Set for question 10:
A. The weight of an object
a. is the same everywhere in the universe
b. depends only upon its mass
c. depends only upon the acceleration of gravity
d. depends upon both its mass and the acceleration of gravity
B. The acceleration of gravity on the surface of Mars is 3.7 m/s/s. Compared with his or her mass and weight on the Earth, an astronaut on Mars has
a. less mass and weight
b. less mass and more weight
c. the same mass and less weight
d. less mass and the same weight
C. Your weight is a measure of
a. your mass
b. the gravitational attraction between you and the earth
c. mechanical equilibrium
d. all of these

Set for question 11:
A. 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
a. continue to follow a circular path
b. follow a straight-line path
B. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
a. the milk carton has no inertia
b. there is an action-reaction pair of forces
c. gravity tends to hold the milk carton secure
d. the milk carton has inertia
e. none of these
C. An object maintains its state of motion because it has
a. mass b. weight c. speed d. acceleration e. all of these

Set for Question 12:
A. An object is propelled along a straight-line path by a force. If the net force were doubled, its acceleration would
a. quadruple b. double c. stay the same d. halve e. none of these
B. If an objects mass is decreasing while a constant force is applied to the object, the acceleration
a. decreases b. increases c. remains the same
C. An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
a. quadruples b. doubles c. stays the same d. halves e. none of these

Set for question 13:
A. According to Newton's third law of motion,
a. there is no such thing as a single force acting on an object
b. for every action there is an equal and opposite reaction force, but each acts on a different object
c. action and reaction forces need not be equal, but must act in opposite directions
d. action and reaction forces must be equal, but need not act in opposite directions
B. Action and reaction forces comprise the parts of
a. a single interaction
b. two interactions
c. none of these
C. A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the
a. air resistance on the ball
b. weight of the ball
c. force of the ball against the bat
d. grip of the player's hand against the ball
e. none of these

Set for question 14:
A. A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same
a. speed b. potential energy c. kinetic energy d. rest energy
B. What does an object have when moving that it doesn't have when at rest?
a. momentum b. energy c. mass d. inertia e. none of these
C. An object at rest may have
a. speed b. velocity c. energy d. momentum e. all of these

Set for question 15:
A. An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high it gains
a. four times as much potential energy
b. twice as much potential energy
c. neither of these
B. Which of the following is the "energy of position"?
a. Kinetic Energy b. Potential Energy c. Rest Mass Energy d. Work
C. The work done in lifting a pile driver goes into
a. Kinetic Energy b. Potential Energy c. Rest Mass Energy d. Power

Set for question 16:
A. Which of the following is the "energy of motion"?
a. Kinetic Energy b. Potential Energy
c. Rest Mass Energy d. Work
B. If the speed of a moving object doubles, then what else doubles?
a. momentum b. kinetic energy
c. acceleration d. all of these
C. When the speed of a moving object is halved,
a. its KE is halved
b. its PE is halved
c. its rest mass energy is halved
d. its momentum is halved

17. The figure below shows a frictionless track, set in a vertical plane. A ball is released from rest from the top A at the left end of the track. Where is the highest point the ball can reach on the right side of the track?

a. Point B, which is at the same height as point A
b. Lower than B
c. Higher than B
d. It depends on how high point A is
e. It depends on how big the ball is

18. The figure below shows a frictionless track, set in the vertical plane. A ball is released from the top A at the left side of the track. Where is the highest point the ball can reach on the right side of the track?

a. Point B, which is at the same height as point A
b. Lower than B
c. Higher than B
d. It depends on how high point A is
e. It depends on how big the ball is

19. The figure below shows a frictionless track, set in a vertical plane. A ball is released from rest at the top, A, at the left side of the track. Where is the highest point the ball can reach on the right side of the tacks?

a. Point B, which is at the same height as point A
b. Lower than B
c. Higher than B
d. It depends on how high point A is
e. It depends on how big the ball is

20. A car rounds a curve on a level road. The centripetal force on the car is provided by
a. inertia
b. gravity
c. friction between the tires and the road
d. the force applied to the steering wheel