Work, Energy, & Power B

What is the unit of power?

• newton

• watt

• meter

• joule

Power is defined as __________.

• force times distance

• force divided by time.

• work divided by time.

• work times time.

If you exert a force of 10.0 N to lift a box a distance of 3 m, how much work do you do?

• 30J

• 300 J

• 90 J

• 900 J

Work is defined by _____________.

• force times time

• force devided by time

• force times distance

• force divided by distance

What is the unit of work?

• Joule

• newton

• watt

• all of these

A force acting on an object does no work if

• a machine is used to move the object.

• the force does not cause the object to move.

• the force is greater than the force of friction.

• the object accelerates.

Which of the following statements is true according to the law of conservation of energy?

• Energy cannot be created.

• Energy cannot be destroyed.

• Energy can be converted from one form to another.

• all of these

An object’s gravitational potential energy is directly related to which of the following?

• its height relative to a reference level

• its mass

• acceleration due to gravity

• all of these

Tags

NGSS.HS-PS2-4

The energy of motion is called

• kinetic energy.

• potential energy.

• thermal energy.

• work.

Work is a transfer of

• energy

• force

• mass

• motion