A place or object used for comparison to determine if another object is in motion is called a

• comparison point
• reference point
• point of view
• motion detector

Jane is sitting in her car. Her mother is driving her from their house to the library. Jane waves as she passes her friend Marina. Which of the following is NOT moving with respect to Jane?

• Marina

• the car

• the library

• Jane's house

A distance vs. time graph shows an object's

• frame of reference
• speed
• acceleration
• favorite food

Velocity is

• speed and acceleration

• constant speed

• a frame of reference

• speed in a given direction

Speed =

• distance / time
• time / distance
• distance * time

On a distance-versus-time graph, a straight line ALWAYS indicates that an object’s speed is _____.

• constant
• zero
• increasing
• decreasing

Acceleration is

• increasing speed
• decreasing speed
• changing direction
• all of the above

Change in speed over a given period of time is

• velocity
• motion
• speed
• acceleration

Does the speedometer of a car read average speed or instantaneous speed?

• average speed

• instantaneous speed

A roller coaster rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration?

• 25 m/s/s

• 6 m/s/s

• -25 m/s/s

• -6 m/s/s