Work, Power & Energy Comprehensive Review

To do work a force must be applied:

• Perpendicular (∟) to the displacement of the object.
• Parallel (∥) to the displacement of the object.

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A  more powerful machine:

• takes longer to do work.
• does work in less time.
• has a greater ability to do work.
• decreases the workload.

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Rocket pushes his space scooter at a constant speed. The graph represents the relationship between the horizontal force exerted by Rocket and the distance the space scooter moves.
What is the total work done by Rocket pushing the space scooter 5.0 meters?

• 5 J
• 10 J
• 20 J
• 25 J

What is the average power generated by Peter Quill aka Star Lord (m = 100 kg) running up a flight of stairs rising vertically 6 .0 m in 5.0 s?

• 0.03 W
• 817 W
• 1176 W
• 1993 W

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If both the mass and the velocity of an asteroid are doubled, the kinetic energy of the asteroid is increased by a factor of:

• 2
• 4
• 8
• 16

At what position does the mass have approximately equal amounts of E_k and E_p?

• A & E
• B & D
• A & C
• D, B & E

If Rocket (m = 50 kg) is thrown into the air by Gamora at a velocity of 20 m/s what is his E_k?

• 500 J
• 10,000 J
• 20,000 J
• 40,000 J

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Rocket's cart is released at Position B. With friction, to what height does his cart reach?

• It depends on the weight of the ball.
• Position C
• Position D
• Position H

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Three minions all with identical masses take three different paths from the starting point  to the top of the sacred mountain in search of an infinity stone. At the finish, which of the three minions has the most E_g?

• The hiker who chose path 1.
• The hiker who chose path 2.
• The hiker who chose path 3.
• The E_g is equal for all three hikers.

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A skateboarder with a mass of 100 kg rides in a half-pipe. His velocity is 20 m/s at the bottom.
 
What vertical distance (height) does he reach?

• 1 m
• 10 m
• 20 
• 30 m

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