Introduction to Energy

Question 1

During a workout, a football player pushes a blocking dummy a distance of 30 m. While pushing the dummy the same distance a second time, what would the player need to change to be certain that power output increases?

Revolt · Accepted Answer

The player would need to use a greater force and take less time.

Question 2

Pablo prepares to lift a barbell. During which stage of the lift does Pablo do work on the barbell?

Revolt · Accepted Answer

when he lifts the barbell from the floor to his chest

Question 3

Power is measured in which unit?

Revolt · Accepted Answer

watts

Question 4

An eagle carries a fish up 50 m into the sky using 90 N of force. How much work did the eagle do on the fish? (Work: W = Fd)

Revolt · Accepted Answer

4500 J

Question 5

Awanita is placing items on a shelf that is 200 cm above the ground. She exerts a force of 20 N to lift a box from the floor to the shelf. She does this in 5 s.What is Awanita’s power output? (Power: P = W/t)

Revolt · Accepted Answer

8 W

Introduction to Energy Answers

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