Work & Energy

Which of the following is a true statement about work?

• It measures how quickly an object accelerates

• It measures how much energy passes into or out of an object

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

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

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What does one joule expended over a time of one second equal?

• One watt
• One hertz
• One volt 
• One joule 

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

• 9000 J 

• 4500 J

• 900 J 
• 450 J 

Tags

NGSS.MS-PS3-5

You move a 12 kg 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 much time the task took

Tags

NGSS.MS-PS3-5

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

• 30 watts
• 3 watts
• 120 watts
• 270 watts

The unit of power is the...

• work/time

• watt

• force

• joule

The unit of work is the ...

• joule

• force

• watt

• algebra

When the object moves in the SAME direction in which the force is applied, positive work is done on an object .

• True

• False

Tags

NGSS.MS-PS3-5

The FARTHER you move an object, the more work you do.

• True
• False

The more POWER you use to move an object, the more work you do.

• Always True

• Sometimes True

• Always False