Power Work Force Problems

Shawn uses 45 N of force to stop the cart 1 meter from running his foot over. How much work does he do?

• 45 W

• 45 J

• 0.022 W

It takes 5 seconds and 250 joules to move a full wagon across the street. How much power is needed?

• 50 W

• 0.02 J

• 50 J

If you increase your work and decrease your time, you will have

• more power

• less power

• same amount of power

• power rating can not be determined

The SI Unit for Work

• Newton (N)

• Joule (J)

• Second (s)

• Watt (W)

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J

• 7.7 J 

• 0.7 J 

• 770 J 

You move an 8-newton weight five meters in 4 seconds. How much power have you generated?

• 160 watts

• 10 watts

• 6.4 watts

• 17 watts

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

• 2.23 W

• 6.03 W

• 17.4 W

• 278.7 W

Tags

NGSS.MS-PS3-5

___________ is done when force is applied to an object and the object moves in the same direction as the force

• power

• machine

• modified lever

• work

Tags

NGSS.MS-PS3-5

This is the SI unit for power.

• m/s2

• Joules

• watts

• F

This is the SI unit for work.

• Joules

• watts

• m/s2

• d/t

Tags

NGSS.MS-PS3-5