Chapter 8 Work and Power: Test A

Work may be measured using units of:

• watts.

• newtons.

• joules.

• newtons per second.

The equation used to calculate work when force is applied to move an object some distance is:

• Work = force + distance

• Work = force ÷ distance

• Work = distance ÷ force

• Work = force × distance

Which of the following use the same units of measurement?

• Power and work

• Force and work

• Energy and work

• Power and energy

If forces A, B and C are equal, the work done by the forces as they are exerted on the box is:

• greatest for force A.

• greatest for force B.

• greatest for force C.

• the same for all forces.

What is the most work that can be done with 100 joules of energy?

• 10 J

• 100 J

• 1,000 J

• 10,000 J

Calculate the work needed to push a block with 4 newtons of force a distance of 10 meters.

• 0.4 joules

• 2.5 joules

• 4 joules

• 40 joules

An automobile engine exerts a force of 500 newtons on a car to travel 4,000 meters. What is the amount of work done by the engine?

• 0.125 joules

• 8 joules

• 4,500 joules

• 2,000,000 joules

A 60-newton block at rest at the bottom of a frictionless incline plane is pushed up the incline:

The amount of work done against gravity is ____ joules.

• 0

• 20

• 60

• 180

The action that would require NO work to be done is:

• holding a 100-pound object over your head.

• pushing a 25-kilogram box of books across the floor.

• pedaling a 100-newton bicycle up a small hill.

• lifting a balloon filled with air from the floor to a desktop.

A 2.2-kilogram crate is pulled by a 30-newton force over a distance of 5 meters. How many joules of work are done by pulling the crate?

• 11 J

• 66 J

• 150 J

• 330 J