work and power

What is the equation for Work?

• W=1/2 (mv²)

• W=Fd

• W=1/2 (kx²)

• W=mgh

A joule is a unit of

• power

• heat

• energy

• current

A 10 kg box is pulled a distance of 3m by a force of 30 N.

The work done is

• 9 J

• 30 J

• 90 J

• 900 J

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

• 320 W

• 400 W

• 500 W

• 2 000 W

Which of the following statements are true about power?

• If person A and person B do the same job but person B does it faster, then person A does more work but person B has more power.

• Powerful people or powerful machines are simply people or machines which always do a lot of work.

• Power refers to how fast work is done upon an object.

• None of these

Finish this sentence:  The higher the wattage....

• The more the power
• The higher the potential energy
• The more work that's being done
• The lower the potential energy

If you push a coffee mug 1.4 m using a force of 5 N, the work done on the mug is?

• 7 J

• 6 J

• 8 J

• 9 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?

• 3.8 m

• 3.7 m

• 3.2 m

• 3.6 m

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A force exerted over a distance to move an object is ______________________.

• power
• work
• momentum
• Watt

The unit used to measure work is the 

• Watt
• Newton
• Joule
• meter