Work By Gravity & Inclined Planes Video Lessons

Concept

# Problem: A 75-kg roofer climbs a vertical 7.0-m ladder to the flat roof of a house. He then walks 12 m on the roof, climbs down another vertical 7.0-m ladder, and finally walks on the ground back to his starting point.How much work is done on him by gravity as he climbs up?How much work is done on him by gravity as he climbs down?How much work is done on him by gravity as he walks on the roof?What is the total work done on him by gravity during this round trip?On the basis of your answer to part E, would you say that gravity is a conservative or nonconservative force? Explain.How much work is done on him by gravity as he walks on the ground?

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###### Problem Details

A 75-kg roofer climbs a vertical 7.0-m ladder to the flat roof of a house. He then walks 12 m on the roof, climbs down another vertical 7.0-m ladder, and finally walks on the ground back to his starting point.

How much work is done on him by gravity as he climbs up?

How much work is done on him by gravity as he climbs down?

How much work is done on him by gravity as he walks on the roof?

What is the total work done on him by gravity during this round trip?

On the basis of your answer to part E, would you say that gravity is a conservative or nonconservative force? Explain.

How much work is done on him by gravity as he walks on the ground?