Energy and Work

It is the ability of an object to perform work.

• Energy

• Force

• Power

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much work is done on an object if the amount of force applied is 50 N and the object was displaced by 2 meters from its original position?

• 100 J

• 25 J

• 100 W

• 25 W

Which of the following situations shows that WORK is done on an object?

• 
• 
• 
• 

True or False. Work is done when the applied force is parallel to the object's displacement.

• True

• False

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

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS3-5

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

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

NGSS.MS-PS2-2

Work is measured in these units.

• m/s

• m/s2

• Joules

• Watts

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