Work, Power, and Simple Machines

What does one newton exerted over a distance of one meter equal?

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

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J
• 7.7 J 
• 0.7 J 
• 770 J 

Tags

NGSS.HS-PS3-2

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 

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NGSS.HS-PS2-1

Which of these is a measure of force?

• 100 newtons
• 100 meters per second
• 100 joules
• 100 watts

Tags

NGSS.HS-PS2-1

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

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

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

If a rock falls from a cliff, at what point are its kinetic energy and its potential energy the same? Ignore air resistance.

• Just as it starts to fall

• just before it hits the bottom

• halfway down

• never

Tags

NGSS.HS-PS3-1

Where would a car traveling on a roller coaster track have the most potential energy?

• At the bottom

• Halfway to the top

• at the top

• halfway to the bottom

• It is always the same

Tags

NGSS.MS-PS3-2

For work to be done on an object,

• some force need only be exerted on the object.

• the object must move some distance as a result of a force.

• the object must move, whether or not a force is exerted on it.

• the object must not move.

Name this simple machine. 

• Pulley
• Wheel and Axle
• Inclined Plane
• Lever