Unit 2 Force and Motion Test Review

A ball is moving in a straight line with a constant speed and has no unbalanced forces acting on it. Which statement would be true about the ball?

• Friction will gradually slow the ball down and stop it.

• Centripetal force will cause the ball to go into a circular motion.

• The ball’s motion won’t change because the forces are balanced.

• Due to the ball’s speed, it will accelerate and go faster.

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How are speed and velocity different?

• Velocity involves time, while speed does not.

• Speed involves time, while velocity does not.

• Velocity has direction, while speed does not.

• Speed has direction, while velocity does not.

Which is an example of friction that is helpful?

• Car engine parts wearing out

• Tires moving a car forward

• Holes developing in your socks

• The erosion of soil by wind

The picture above shows what happens when a feather and a rock are dropped at the same time in a vacuum chamber (a place with no air). Which of the following is a true statement?

• The rock and the feather are accelerating at the same rate.

• The rock and the feather are subject to air resistance.

• The rock and the feather are moving with constant speed.

• The rock and the feather reach the ground at different times.

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What is the formula to find speed?

• Speed = Distance X Time

• Speed = Distance + Time

• Speed = Distance / Time

• Speed = Distance - Time

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Look at the graph below. What was happening to the car from E to F?

• Positive Acceleration (speeding up)

• Negative Acceleration (slowing down)

• The car was changing its direction.

• The car was maintaining a constant velocity.

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To produce change in motion, a force must be a(n) _________.

• balanced force

• gravitational force

• frictional force

• unbalanced force

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Which of these shows 3N to the left?

• 
• 
• 
• 

According to the graph, which of the following statements correctly describes the motion of the cars?

• The velocity of car A is increasing at a constant acceleration.

• The velocity of car B is increasing at a constant acceleration.

• The velocity of car A is decreasing at a constant acceleration.

• The velocity of car B is decreasing at a constant acceleration.

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If a tennis ball, a Ping-Pong ball, and a bowling ball were dropped at the same time from the same height, which would hit the ground first? (Assume there is no air resistance.)

• The tennis ball would hit first.

• The bowling ball would hit first.

• The Ping-Pong ball would hit first.

• All would hit at the same time.

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