Work, Power and Energy Word Problems

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 J 

• 660 J

• 900 J 

• 1200 J 

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts

• 3 watts

• 120 watts

• 270 watts

Which of the following would produce the most power?

• A mass of 10 kilograms lifted 10 meters in 10 seconds 

• A mass of 10 kilograms lifted 10 meters in 5 seconds

• A mass of 5 kilograms lifted 10 meters in 5 seconds

• A mass of 5 kilograms lifted 5 meters in 10 seconds

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 

• It measures how much effort is applied over a certain distance

• It measures the change in an object's rate of speed

• It measures how much time it takes to move a massive object

The rate (how fast) at which work is being done.

• Power

• Joules

• Work

• Newton

• No choice is correct

The rate at which work is done.

• power

• force

• inertia

• energy

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

• 1500 N

• 15 N

• 1.5 N

• 150 N

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NGSS.MS-PS2-2

How much power is used to lift a box that weighs 50N 10 m in 10s?

• 5 W

• 50 W

• 500 W

• 5,000 W

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-5

What are the units for the power formula:

power=work/time

• W=s/J

• J=W/s

• J=s/W

• W=J/s

What is power?

• when an object changes position by moving in the direction for the force that is being applied

• the unit used to measure power

• the amount of work a person does within a given period of time