Unit 11 lesson 1 What Is Motion? G4

To make sure your measurements are correct, it is important to use appropriate units. Which of these is a unit of distance?

• A. gram

• B. liter

• C. meter

• D. second

To make sure your measurements are clear, it is important to use appropriate units. Which of these is a unit of time?

• A. gram

• B. liter

• C. meter

• D. minute

Cars, bicycles, and people can all be objects in motion. What is it about an object in motion that is constantly changing?

• A. acceleration

• B. position

• C. speed

• D. velocity

Cars, bicycles, animals, and people are all objects that can be in motion. Which statement about motion is correct?

• A. An object in motion is accelerating.

• B. Motion is the change in position of an object.

• C. Gravity and friction are responsible for all motion.

• D. An object in motion has no speed, but it does have velocity.

Velocity is a measurement related to motion. What is velocity?

• A. the rate at which acceleration changes

• B. a force that opposes motion between two surfaces that are touching.

• C. a measure of both the speed and direction of a moving object

• D. the same as speed, that is, a measure of how fast something moves

Forces can affect the rate of an object’s motion. Which of these is a force?

• A. acceleration

• B. gravity

• C. speed

• D. velocity

Malik rode his bike. He traveled 30 km. It took him 3 hr. If Malik rode at a constant speed, how fast was he traveling?

• A. 3 km/hr

• B. 10 km/hr

• C. 30 km/hr

• D. 90 km/hr

A train travels 200 km in the same direction in 2 hr. What is this train’s velocity?

• A. 2 km/hr

• B. 100 km/hr North

• C. 200 km/hr South

• D. 400 km/hr