Motion Test

An object that changes position relative to a reference point is

• moving at constant speed.

• in motion.

• moving at constant velocity.

• stationary

Average speed can be represented by the mathematical expression

• time + distance

• distance X time

• distance / time

• time – distance

The average speed of a runner who runs 400 m in 96 s is ________.

Speed=distance/time

• 4.2 m/s

• 0.19 m/s

• 96 m/s

• 312 m/s

The __________ of an object consists of its speed and direction.

• instantaneous speed

• average speed

• velocity

• displacement

A car moving at an average speed of 44 mi/h for 4.25 h has traveled...

distance = velocity X time

• 13 miles

• 0.08 miles

• 55 miles

• 187 miles

On a distance vs. time graph of an object's motion, distance is usually:

• measured in ft/min.

• the dependent variable.

• plotted on the x-axis.

• greater than time.

A pitcher throws a baseball toward home plate, a distance of 60.5 ft. The ball reaches home plate in 0.63 s. What is the velocity of the ball?

Velocity (speed) = distance / time

• 38 ft/s

• 96 ft/s

• 96 ft/s toward home plate

• 8 ft/s toward home plate

When the motion of an object is shown by a straight line on a distance vs. time graph with distance on the y-axis, the slope of the line is the

• displacement

• speed

• distance traveled

• time of travel

On a bus traveling north at 20.0 m/s, a child stands up and walks toward the back of the bus at 1.3 m/s. What is the child's resultant velocity?

• 18.7 m/s south

• 18.7 m/s north

• 21.3 m/s south

• 21.3 m/s north

Displacement must always indicate

• time

• speed

• velocity

• direction