PS_Chapter11_Motion

An object that changes position relative to a reference point is definitely:

• stationary

• in motion

• moving at a constant speed

• moving at a constant velocity

What term is used to describe the speed and direction of an object?

• velocity

• average speed

• instantaneous speed

• displacement

The average speed of a runner who travels 500.0 m in 1.6 min is (NOTICE! - answer units in m/s)

• 0.19 m/s

• 5.2 m/s

• 96 m/s

• 312 m/s

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

• 38 ft/s²

• 96 ft/s²

• 38 ft/s

• 96 ft/s

Speeding up, slowing down, and changing direction is best described as:

• velocity

• distance

• displacement

• acceleration

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

• distance traveled

• speed

• displacement

• time of travel

Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of:

• 0.32 m/s

• 0.32 m/s²

• 3.1 m/s

• 3.1 m/s²

A cyclist, traveling at an speed of 10.0 m/s, accelerates at a rate of 0.500 m/s² for 9 sec. What is their final speed?

• 14.5 m/s

• 14.5 m/s²

• 5.5 m/s

• 5.5 m/s²

A velocity vs time graph of motion shows a negative, constant slope. What does this represent?

• speed is increasing over time

• speed is decreasing over time

• displacement is increasing over time

• displacement is decreasing over time

When velocity changes by the same amount over each time interval, acceleration is:

• zero

• constant

• positive

• negative