Work and Energy Introduction

What is energy?

• the mass of an object

• the ability to cause changes in matter

• the size of an object

• the weight of an object

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NGSS.MS-PS3-5

Which of these is not a form of energy?

• heat

• light

• sound

• mass

What is kinetic energy?

• stored energy

• energy of motion

• elastic energy

• gravity

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NGSS.MS-PS3-1

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What is potential energy?

• energy of motion

• electricity

• sound

• stored energy based on an object's location

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NGSS.MS-PS3-2

The diagram of Situation 1 shows one person failing to move a refrigerator up a ramp, while the diagram of Situation 2 shows two people successfully pushing a refrigerator up a ramp. What comparison can be made about the work done in the two situations?

• In Situation 1, no work was done, while 12,000 J of work was done in Situation 2.

• In Situation 1, 1,600 J of work was done, while 3,000 J of work was done in Situation 2

• In Situation 1, no work was done, while 8,000 J of work was done in Situation 2

• In Situation 1, 1,400 J of work was done, while 1,300 J of work was done in Situation 2

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NGSS.MS-PS2-2

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A force of 50 N is applied to an object to move it 3 meters. How much work is done on the object?

Mathematical Equivalence

ON

Work is done when an object moves through a ​ ​ (a)   because of a ​ (b)   acting upon the object

• distance

• force

• energy

• work

• power

Tags

NGSS.MS-PS3-5

How does using an inclined plane make lifting a load easier?

• it makes the mass levitate upward

• it increases the force needed to lift a mass

• it decreases the force needed to lift a mass

• it doesn't help

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NGSS.MS-ETS1-1

What is the formula for work?

• Force = work x distance

• Distance = force x work

• Work = force x distance

• Work = force x mass

Micheal was at the gym and he was trying to lift the weights, but he could not lift it. Finally Micheal decided to go home. The next day he complained to the trainer that he did all that hard work for nothing! The trainer asked the other trainers "did he really do any work?"

Michelle: "Yes, because Micheal was tired"

Jose: "No, because Micheal transformed his energy into nothing."

Emily: No, Because Micheal pulled and pushed but the weight did not move."

Who was right?

• Michelle

• Jose

• Emily

Answer explanation

Work is force moving an object. Since the object did not move then there was no work done.

Tags

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