Work, Power, and Energy

Work is measured in the same units as:

• Force

• Momentum

• Mass

• Energy

Which term is the unit of Power?

• Joule

• Newton

• Watt

• Hertz

A 2.2 Kg mass is pulled by a 30 N force through a distance of 5 meters. What amount of work is done?

• 11 J

• 66 J

• 150 J

• 330 J

Work is being done when a force...

• Acts vertically on a car that can move only horizontally

• Is exerted by 1 team in a tug of war when there is no movement

• Is exerted on a wagon while pulling it up a hill

• Of gravitational attraction acts on a person standing on the surface of the Earth

A force of 80 N pushes a 50 kg objects across a level floor for 8 meters. The work done is...

• 10 J

• 400 J

• 640 J

• 3920 J

A 2 Kg mass is pushed along a horizontal, friction-less surface by a 3 N force that is parallel to the surface. How much work is done in moving the mass 1.5 meters horizontally?

• 4.5 J

• 2 J

• 3 J

• 30 J

A 2 Kg mass is pushed along a horizontal, friction-less surface by a 3 N force that is parallel to the surface. How much gravitational potential energy would be gained by the mass if it is moved 2 meters horizontally?

• 0 J

• 6 J

• 40 J

• 4 J

The work done in lifting an object must result in an increase in the object’s...

• Gravitational Potential Energy

• Kinetic Energy

• Heat Energy

• Electrical Energy

If a mass in lifted the same vertical distance (same work done) but the time is increased, the power...

• Decreases

• Increases

• Remains the same

As the power of a machine is increased, the time required to move an object a fixed distance...

• Decreases

• Increases

• Remains the same

• Not enough information given