Chapter 2 Test: Motion

Which of the following do you calculate when you divide the total distance traveled by the total travel time?

• average speed

• constant speed

• variable speed

• instantaneous speed

Which of the following is the SI unit of acceleration?

• s/km²

• km/h

• m/s²

• cm/s

Which of the following is not used in calculating acceleration?

• initial velocity

• average speed

• time interval

• final velocity

A car, a bicycle, a mouse, and a bug have the same velocity. Which has the greatest momentum?

• the car

• the bicycle

• the mouse

• the bug

In which of the following conditions does the car not accelerate?

• A car moves at 80 km/h on a flat, straight highway.

• The car slows from 80 km/h to 35 km/h.

• The car turns a corner.

• The car speeds up from 35 km/h to 80 km/h.

How is speed defined?

• acceleration/time

• change in velocity/time

• distance/time

• displacement/time

Which best describes why projectiles move in a curved path?

• A) They have constant horizontal velocity and vertical acceleration.

• B) They have horizontal acceleration and constant vertical velocity.

• C) They have horizontal momentum and constant vertical velocity.

• D) They have horizontal acceleration and vertical momentum.

Knowing only a hurricane’s speed is not enough information to be able to warn people to evacuate because:

• It doesn't provide details on the hurricane's size or area of impact.

• It doesn't specify the potential path or landfall location.

• It doesn't reveal the storm's intensity or rainfall potential.

• All of the above information are needed.

Which of the following represents the greatest speed: 20 m/s, 200 cm/s, or 0.2 km/s?

• 20 m/s

• 200 cm/s

• 0.2 km/s

Acceleration can occur when a car is moving at constant speed. What must cause this acceleration?

• A change in the direction of motion.

• An increase in the car’s engine power.

• A reduction in friction.

• Variation in gravitational field.