Motion Test Review

A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?

• Equal to the force pulling the car down the hill
• greater than the force pulling the car down the hill
• Greater than the force pulling the car up the hil
• smaller than the force pulling the car uphill

What does velocity include that speed does not?

• direction
• distance
• time
• weight

a car moving at an average speed of 55 mph for 4.25 hours has traveled how far?

• 0.08
• 13
• 55
• 234

Peter runs in a constant direction on a straight road. The velocity vs. time graph of Peter’s motion shows a straight line with a negative slope. What does the line tell you about Peter’s speed?

• Its increasing
• its decreasing
• it is decreasing, then increasing
• it is constant

What is the proper SI unit for speed?

• mph
• ft/s2
• m/s
• change in speed/time

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

On a speed-time graph, a line with a negative slope indicates that the object is doing which of the following?

• speeding up
• slowing down
• not moving
• traveling at a constant speed

On a bus traveling north at 20.0 m/s, a child stands up and walks toward the back of the bus at 1.3 m/s. What is the child’s resultant velocity?

• 18.7 m/s north
• 18.7 m/s south
• 21.3 m/s north
• 21.3 m/s south

On a speed-time graph, a line with a negative slope indicates that the object is doing which of the following?

• curved line with slope of zero
• flat line with slope of zero
• jagged line with a negative slope
• curved line with a positive slope

A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?

• the mass has increased
• gravity has inreased
• object is experiencing friction
• the momentum of the object has reached a maximum