Work Power & Energy

Work is measured in the same units as:

• Force

• Momentum

• Mass

• Energy

Tags

NGSS.MS-PS3-5

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

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS3-2

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

An electric motor lifts an object that weighs 98 N a distance of 100 meters in 10 seconds. The power used by the motor is...

• 9.8 W

• 98 W

• 980 W

• 9800 W

If the velocity of an automobile is doubled, its kinetic energy...

• Decreases to one-half

• doubles

• decreases to one-fourth

• quadruples (four times)

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5