Physics Work and Power

Which are correct units for work?

• N x s

• N x m

• J/s

• W

Which are correct units for power?

• N x s

• N x m

• J

• J/s

Whenever work is done, energy changes

• Law of Conservation of Energy

• Work-Energy Theorem

• Newton's Fourth Law

• Efficiency

Tags

NGSS.MS-PS3-5

The force used in the work equation has to always be acting in the same direction as the movement of the object.

• True

• False

Moving the car by the diagonal route uses 20 000J and lifting the car vertically uses 24 000J of energy. If both routes take the same time, (10 s) which route uses more power?

• Vertical one less energy is used per second

• Diagonal one as less energy is used per second

• Vertical one as more energy is used per second

• Diagonal one as more energy is used per second

Tags

NGSS.MS-PS3-5

Winnie and Eeyore have the same mass and have just finished climbing the same tree, but Eeyore was 4 seconds faster then Winnie. Who used the most power?

• Winnie as he took the longer time and did the same amount of work as Eeyore

• Winnie as he is shorter and could grip more as so did more work overall

• Eeyore as he did the same amount of work as Winnie but in a shorter time.

• Eeyore as he did more work than Winnie but in a shorter time

On a force versus change in position graph, the area under the curve is a representation of:

• force

• position

• KE

• PE

• Work

Is this an example of work? 
A rocket accelerates through space.

• True

• False

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is the weight of an object if 75 J of work is done to lift it uniformly 6.0 m

• 13 N

• 450 N

• 1.3 kg

• 130 kg

Which of the following would be an example of Work

• 13W

• 14m

• 45J

• 10N

Tags

NGSS.MS-PS3-4