Physical Science Power

In order to do work on an object, the force you exert must be...

• The maximum amount of force you are able to exert.

• In the same direction as the object's motion.

• In a direction opposite to Earth's gravitational force.

• quick and deliberate.

How do we calculate work?

• W = F * d

• w = f / d

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

How much work was done?

• 2 J

• 0.5 J

A force of 15 newtons is used to push a box along the floor a distance of 3 meters.  How much work was done?

• 3 J

• 45 J

Tags

NGSS.MS-PS3-5

It took 500 newtons of force to push a car 4 meters.  How much work was done?

• 2,000 J

• 125 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

How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?

• 70 watts

• 1750 watts

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task

• Work takes into account the time it takes to complete a task

• Power is force/area

• Work is force/area

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5