Energy Review Penner 1

A rock is dropped from the edge of a cliff, where it starts with 80 J of potential energy. 30 meters down, it now has 40 J of kinetic energy. How high is the cliff?

• 20 m

• 40 m

• 60 m

• 80 m

• 100 m

A box is pushed from rest across a frictionless surface with a force that changes with distance, as shown in the graphs. Which graph represents the situation in which the box will be traveling the fastest?

• A

• B

• C

• D

A basketball is thrown into a basket as shown in the diagram. Which graph best represents the ball's kinetic energy over time?

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How much work must be done to stop an 1800 kg vehicle traveling at 30 m/s?

• 18 000 J

• 54 000 J

• 530 000 J

• 810 000 J

A 75 kg person climbs a 4.5 m high set of stairs in 5.0 s. What is the minimum amount of power generated?

• 68 W

• 660 W

• 1700 W

• 3300 W

Angel (70 kg) and Britney (60 kg) both start from rest and skate down a hill as shown. Which one is going faster at the bottom of the hill (assume no friction or air resistance).

• Angel

• Britney

• Both have the same speed

• Can't tell without knowing the slope angle.

Angel (70 kg) and Britney (60 kg) both start from rest and skate down a hill as shown. Which one generates more power getting to the bottom of the hill? (assume no friction or air resistance).

• Angel

• Britney

• Both have the same power

• Can't tell without knowing the slope angle.

Which car has the most work done to it?

• A

• B

• C

• D

The velocity of an object over time is plotted on the graph. In which phase is NO work being done? Check all that apply.

• A

• B

• C

• D

A rollercoaster rolls from rest at point A over an alligator pit for extra excitement. The maximum height achieved by the coaster is...

• Higher than at point A

• The same as point A

• Lower than point A

• Dependent on how many riders get eaten