Work, Power and Energy

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

• 30 watts

• 3 watts

• 120 watts

• 270 watts

You move an 8-newton weight five meters in 4 seconds. How much power have you generated?

• 160 watts

• 10 watts

• 6.4 watts

• 17 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-PS3-5

Work is done on an object when the object moves in the SAME direction in which the force is applied.

• True

• False

Simple machines make work easier by increasing what?

• The distance over which work is done 

• The force needed to do work 

• The time required to do work

• The acceleration of a massive object 

Which of these is a measure of force?

• 100 newtons

• 100 meters per second

• 100 joules

• 100 watts

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?

• The mass of the box

• The slope of the ramp 

• The direction the box moved

• How long the task took

Work divided by time equals...

• energy

• power

The unit of work is the ...

• joule

• force

The unit of power is the...

• work

• watt