Work and Energy Quiz

What is the term used to describe the rate at which work is performed?

• momentum

• power

• force

• work

Work can also be defined as a transfer of:

• force

• pressure

• energy

• power

If you apply a force of 10,000 N to the back of a car while trying to push a car out of a ditch and the car never moves, how much work have you done?

• 10,000 J

• 5000 J

• 0 J

• 2500 J

What is the appropriate unit for measuring work?

• Newton

• Kilogram

• Joule

• Kilopascal

______ is done when a force is applied to an object and the object moves as a result.

• power

• pressure

• kinetic energy

• work

Without changing the actual amount of work being done, how can power be increased?

• decrease the amount of time the work was done in

• increase the amount of time the work was done in

• decrease the force used

• increase the force used

If a machine has a mechanical advantage of 8, this would mean:

• work would seem 8 times easier to do

• effort force is decreased by 16%

• work would seem 8 times harder to do

• input distance is increased by a factor of 4

The 2 simple machines that are modified versions of the inclined plane are the ______ and the ______.

• pulley/wheel and axle

• wedge/screw

• lever/pulley

• wedge/wheel and axle

The number of times a machine multiplies your effort force is called:

• leverage

• mechanical advantage

• resultant vector

• recumbent vector

What is the unit of mechanical advantage?

• Joule

• Newton

• Torr

• it has no unit