Power Work Force Problems

What formula is used to calculate power?

• P=Ft

• P=F/t

• P=Wt

• P=W/t

A boy lifts a 30N toy car 2 meters above the ground. How much work did the boy do on the car?

• 60 J

• 15 J

• 28 J

• 32 J

Tags

NGSS.MS-PS3-2

A crane does work of 13,500 J with a force of 5200 N to lift a beam. How far was the beam lifted?

• It was not lifted.

• 10 m

• 2.6 m

• 5 m

Tags

NGSS.MS-PS2-2

If it takes 50 J of work to climb a set of stairs, how fast would you have to climb them to use 5 Watts of power?

• 2 s

• 5 s

• 9 s

• 10 s

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?

• 360 W 

• 60 W

• 3600 W

• 600 W

Tags

NGSS.MS-PS3-5

If it takes 20 N to move a box, how long will it take a 20W motor to move the box 5m?

• 5 sec

• 1 J

• 1 sec

• 5 W

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

How much power does it take to life 50N, 10m high in 10sec?

• 50 W

• 5000 W

• 500 J

• 50 m

How long will it take a 100W motor to lift a 5kg mass 20m?

• 1 sec

• 2000 Sec

• 500 sec

• 500 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A man of weight 900 N walks up a hill of height 10 m. What is the total work done?

• 0 J       

• 90 J

• 900 J   

• 9000 J             

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of these is a measure of force?

• 100 newtons

• 100 meters per second

• 100 joules

• 100 watts

Tags

NGSS.MS-PS2-1