AP Physics Work and Energy

Mr. B's and Mr. P's classes competed in a game of tug of war. Mr. B's class pulled to the right with a force of 4,000 N. Mr. P's class pulled to the left with a force of 5,000 N. As a result the rope moved 5.1 m to the left. How much work was done by the net force?

• 4100 J

• 3100 J

• 5100 J

• 45900 J

Tags

NGSS.HS-PS3-1

How are work and energy related?

• The work done by an external force acting on an object causes a change in the mechanical energy of the object.

• Work is the same thing as energy. They are equal.

• Energy is mgh, and work is mv²/2

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-3

If you pull the trolley along a flat floor horizontally. Which force do you use to calculate the work done.

• Weight

• Pulling force

• Normal forrce

• Friction

Tags

NGSS.HS-PS2-1

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

• 1600 J

• 160 J

• 3600 J

• 1800 J

Tags

NGSS.HS-PS2-1

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-PS3-5

Work is measured in these units.

• m/s

• m/s2

• Joules

• Watts

Tags

NGSS.HS-PS2-1

What is the formula for work?

• Force = work x distance

• Distance = force x work

• Work = force x distance

• Work = force x mass

If the net work done on an object is negative, then the object’s kinetic energy...

• decreases

• remains the same

• increases

• is zero

Tags

NGSS.HS-PS3-1

On a force versus change in position graph, the area under the curve is a representation of...

• power

• KE

• PE

• work

Groot rescues Rocket from the bottom of a deep pit. Groot expends 1000 J of energy lifting Rocket who has a mass of 50 kg out of the pit. How deep is the pit?

• 0.5 m

• 2 m

• 4 m

• 10 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1