Work, Power and Energy

A student lifts a box with 10N of force to a shelf 2.5 meters high. How much work do they do?

• 5 J

• 20 J

• 25 J

• 250 J

Tags

NGSS.MS-PS3-5

If 150 J of work is needed to move a box 10 meters, what force was used to move the box?

• 10 N

• 1.5 N

• 15 N

• 5 N

A student pushes a block with a force of 50 N, a distance of 4.5 m. What is the work used?

• 225 J

• 200 J

• 11.11 J

• 0.09 J

Calculate the work in lifting a 35 kg sack 4 meters up.

(Hint: Fg = m*g )

• 1400 J

• 140 J

• 14 J

• 8.75 J

How much work is used on a 20 N crate lifted 2 m?

• 10 N

• 10 J

• 40 J

• 40 N

The unit of work is

• Joule

• Newtons

• Meters

• Watts

What is the equation for work?

• W=Fd

• P=W/t

• W=ma

• W=at

What is the equation is power?

• W = Ft

• W=Fd

• P=W/t

Three boxes each weigh 100 N. A man lifts all the boxes together from the ground on to a shelf that is 1.5 m above the ground. The man takes 2.0s to do this. How much power is used?

• 300 W

• 225 W

• 900W

• 75 W

A weight-lifter raises a 2000 N weight through a vertical height of 2.0 m in 0.8 s. What power is used?

• 4000 watts

• 5000 watts

• 3500 Watts

• 4500 watts

Tags

NGSS.HS-PS2-1