Motion Review 3

What condition is necessary for an object to make a good reference point?

• the object is moving at a constant speed
• the object is accelerating
• the object is fixed relative to the motion you are trying to describe
• the object is large

What is a vector?

• A measurement that has both a direction AND a magnitude.
• The circumference of a circle.
• A large measurement.

Which of the following is NOT true about displacement?

• Displacement is the change in position.
• Displacement is a vector.
• Displacement is found by the final position minus the initial position.
• Displacement is the same thing as speed.

Grace walks for a few minutes, then runs for a few minutes. During this time, her average speed is ...

• the same as her final speed
• greater than her final speed
• less than her final speed
• zero

A constant velocity means acceleration is ...

• positive
• increasing
• negative
• zero

Tyler and Justin run with the same constant speed but in different directions. The boys have ...

• different speeds
• different velocities
• different accelerations

A car accelerates if it:

• Speeds up
• Slows down
• Goes around a curve
• Speeds up AND slows down
• Speeds up AND slows down AND goes around a curve

Which statement best describes the motion pictured in the graph?

• the object is not moving
• the object is slowing down
• the object is speeding up
• the object is going backwards

Which statement best describes the motion pictured in the graph?

• the object is not moving
• the object is staying at the same speed
• the object is speeding up
• the object is going forward

A car travels at 40 m/s and slows down to 20 m/s. During this time, the car has ...

• constant velocity
• no acceleration
• positive acceleration
• negative acceleration