Calculating Work and Power

How do we calculate work?

• W = F * d

• w = f / d

Which is the correct unit for work?

• Joules

• Newton

• meter

• Watts

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NGSS.MS-PS3-5

The rate at which work is done.

• Joules
• Power
• Watts
• Newtons

How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken

What is the correct unit for power?

• Watt

• Joules

• Newtons

• seconds

It took 500 Newtons of force to push a car four meters. How much work was done?

• 2000 J

• 125 J

• 0.008 J

• 500 J

Tags

NGSS.MS-PS2-2

1. A book weighing 1.0 newton is lifted 2 meters.  How much work was done?

• 2 J
• 0.5 J

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NGSS.HS-PS2-4

NGSS.HS-PS3-2

What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?

• 250 W

• 0.004 W

• 56,250 W

• 25 W

Tags

NGSS.HS-PS3-1

How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)

• 70 W

• 3.5 W

• 7 W

• 350 J

A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?

• 16.67 watts
• 50 watts