Force and Motion Unit Review

Which investigation will best test the effects of gravity on moving objects?

• pencils falling from the same height

• balloons floating upward from the same height

• a bicycle speeding up on a flat surface

• a ball slowing down on a flat surface

A man is pushing a ball up a hill. If the man stops pushing the ball and steps out of the way, what will most likely happen to the ball?

• It will stop on the hill.

• It will roll down the hill.

• It will roll to the side toward the man.

• It will continue to roll up the hill.

Which best describes the role friction plays in the operation of a car?

• Friction makes a car go faster.

• Friction keeps a car from stopping.

• Friction turns the car in a new direction.

• Friction helps a car slow down and stop.

Carey left a bowling ball and kickball outside on a windy day. Which best explains why the kickball moved but the bowling ball did not?

• The kickball has less mass so it was easier to move.

• The force of gravity acting on the bowling ball is greater.

• The mass of the kickball is greater so it is easier to move.

• The force of gravity acting on the kickball is greater.

A helicopter traveled 200 miles in one hour. During the next hour, it traveled another 200 miles. Which best describes the average speed of the helicopter during the second hour?

• slower than the first hour
• faster than the first hour
• about the same as the first hour
• exactly the same as the first hour

A news truck traveled 60 miles in one hour on Thursday and 240 miles in four hours on Friday. Which best describes the average speed of the truck? (speed = distance ÷ time)

• The truck drove more slowly on Friday.
• The truck drove more slowly on Thursday.
• The truck drove the same speed on both days.

Michelle drove 300 miles in 6 hours. What was Michelle’s speed?
(speed = distance ÷ time)

• 30 miles per hour
• 50 miles per hour
• 60 miles per hour
• 80 miles per hour

The Great Smoky Mountain Railroad travels 26 km between Bryson City and Dillsboro. The trip takes 50 minutes. How fast is the train moving?

• 0.52 km/min
• 1.9 km/min
• 24 km/min
• 76 km/min

This graph shows the motion of an object. Which best describes the motion of the object?

• It is sitting still.

• It is moving at a constant speed.

• It continually increases its speed.

• It travels at constant speed and suddenly stops.

Which graph best illustrates a train sitting at the station waiting to depart?

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