Acceleration and free fall

Multiple Choice

A negative acceleration means that an object is _____. 

• not accelerating
• not moving
• speeding up 
• slowing down 

Multiple Choice

Which of the following is NOT true concerning acceleration?

• Acceleration occurs when an object travels in a straight line at a constant speed.

• Acceleration is a change in the velocity of an object.

• Acceleration can occur when an object stays the same velocity but changes direction.

• Acceleration can be either positive or negative.

Multiple Choice

In which of the following cases does a car have zero acceleration?

• A car speeding up after a stoplight turns green.

• A car slowing down when it approaches a stop sign.

• A car set on cruise control so that is maintains 45 mi/hr.

• A car turning a curve at a constant speed.

Multiple Choice

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes
• It doesn't
• It slows down
• Its speeds up  

Multiple Choice

A roller coaster accelerates from an initial speed of 6.0 m/s to a final speed of 70 m/s over 4 seconds. What's the acceleration?

• 24 m/s²

• 18 m/s²

• 16 m/s²

• 16 m/s

Multiple Choice

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr

Multiple Choice

Which graph represents zero acceleration (constant velocity)?

• A
• B
• C
• D

Multiple Choice

Which graph represents the greatest acceleration?

• A
• B
• C
• D

Multiple Choice

The slope of a velocity - time graph represents?

• Velocity

• Displacement

• Acceleration

• Time