Acceleration

Change in velocity over a given period of time is

• instantaneous speed

• speed

• motion

• acceleration

If an object is accelerated, all the following may occur EXCEPT:

• a change of speed

• a change of direction

• a change of speed and direction

• it remains motionless

Describes the motion of an object that is slowing down is:

• positive acceleration

• deceleration

• gravity

• free fall

Carlos glances at the speedometer on his bicycle as he begins to roll downhill. It indicates he is traveling at 12 miles per hour when he initially looks at it and 20 miles per hour, 4 seconds later. His acceleration during this interval was:

• 2 mph/s

• 5 mph/s

• 3 mph/s

• 8 mph/s

A line curving upwards on a position vs time graph represents

• the object is accelerating

• the object is traveling at a constant speed

• the object is not moving

• the object is slowing down

A horizontal line on a velocity vs time graph shows...

• the object is accelerating

• the object is slowing down

• the object is traveling at a constant speed

• the object is not moving

On a velocity vs time graph, the steeper the line means

• faster the acceleration

• slower the acceleration

• traveling at a constant speed

• not moving

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/s²

• -7.5 m/s²

• -0.5 m/s²

• 0.5 m/s²

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds

• 35 seconds

• 0.3 seconds

• 3.3 seconds

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

• -16 m/s

• -16 m/s²

• 16 m/s

• 16 m/s²