Physical Science Power

What is the definition of power?

• the amount of work an object does

• the rate at which force is applied

• the amount of matter in an object

• the rate at which work is done

There are two conditions for work to be done....

• Constant applied force on the object

• An object travels a distance in the same direction of force

• Both

Power is ___________

• Is the rate of energy transfer.

• Speed of doing work is work done in a certain time.

• both

• none

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

1 kilowatt (KW) = ____________

1 megawatt (MW) = __________

• 1000 W

  1000000 W

• 10 W

  100 W

• 100000 W

  100 000 000 W

Work is done ___________

• only when force is applied

  on an object

  cause the object to move

  into the opposite direction

  as applied force.

• only when force is applied

  on an object

  cause the object to move

  into the same direction

  as applied force.

A cake mixer is capable of doing 500 J of work over the course of 2.5 seconds. What is the power output of the cake mixer? Be sure to include a unit with your answer!

Tags

NGSS.MS-PS3-5

Based on the information provided in the picture, what is the Kinetic Energy at point B?

Tags

NGSS.MS-PS3-5

In order for work to be done on object, which of the following statements must be true? Check all that apply.

• A force must be acting on an object

• The object must remain still

• The object must be lifted off the ground

• The object must move

Tags

NGSS.MS-PS3-5

Which of the following quantities are measured in joules (J)? Check all that apply.

• Power

• Work

• Energy

• Momentum

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-4

Assuming there are no outside forces, the total mechanical energy of the rollercoaster will:

• Remain constant

• Change depending on the height of the rollercoaster

• Change depending on the speed of the rollercoaster

• More than one of the above

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5