Retake Study Guide Unit 3

The four graphs show the properties of Newton's second law of motion. Which graph is incorrect and why?

• Graph W is incorrect because as the mass of an object increases, the acceleration of the object decreases.

• Graph X is incorrect because as the mass of an object increases, the force required to move the object decreases.

• Graph Y is incorrect because as the force applied to an object increases, the acceleration of the object decreases.

• Graph Z is incorrect because as the acceleration of an object increases, the force required to move the object decreases.

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The graph shows a bicycle rider's motion during the first portion of a race. What conclusion can be drawn about the rider's motion?

• The rider maintained a constant speed during the time period between 0 and 10 seconds.

• The rider did not move during the time period between 10 and 15 seconds.

• The rider rode downhill during the time period between 15 and 20 seconds.

• The rider slowed down during the time period between 15 and 20 seconds.

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Which of the following graphs shows how the speed of a rolling ball is affected by friction?

• Graph A: Speed increases over time.

• Graph B: Speed remains constant over time.

• Graph C: Speed remains constant over time.

• Graph D: Speed decreases over time.

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An object that is traveling east at a constant rate has

• velocity, but neither acceleration nor speed.

• speed, but neither velocity nor acceleration.

• speed and velocity, but no acceleration.

• acceleration and speed, but no velocity.

A car is traveling 20 kilometers an hour, then changes direction at a fork in the road. The action that the car takes changes its

• acceleration, but not its velocity.

• speed, but not its acceleration.

• speed, but not its velocity.

• velocity, but not its speed.

The picture shows a falling ball. Which statement best describes the motion of the falling ball in the picture?

• The ball is at a constant speed.

• The ball is changing direction.

• The ball is slowing down.

• The ball is speeding up.

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Susan visited the circus with her father. In one act, an acrobat stood on one end of a seesaw. A heavy weight was dropped onto the other end, and the acrobat flew high up in the air. He flipped four times before landing safely in a net. Which forces are acting on the acrobat while he is rising into the air?

• The initial force of motion pulls on the acrobat while the force of gravity pushes on the acrobat.

• The initial force of motion pushes the acrobat while the force of gravity pulls on the acrobat.

• The force of friction pushes on the acrobat while the buoyant force pulls on the acrobat.

• The force of friction pulls on the acrobat while the force of gravity pushes on the acrobat.

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Which graph represents an object moving at a constant speed?

• Graph A

• Graph B

• Graph C

• Graph D

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Which graph represents an object that is decelerating?

• Graph A

• Graph B

• Graph C

• Graph D

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Which graph indicates an object moving back towards the starting point?

• Graph A

• Graph B

• Graph C

• Graph D

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