# Mini-Quiz: Work Done by Gravity Against Inertia and Air Resistance

by Ron Kurtus (revised 27 June 2013)

Take this Mini-Quiz to check your understanding of the lesson material.

1. When is the resistance from inertia zero for a falling object?

It can never be zero because of Newton's Laws

When the object reaches the terminal velocity for air resistance

Right after the object starts to fall

2. How does the work done by gravity vary with inertia and air resistance?

The work is only dependent on the force of gravity and displacement

The greater the air resistance, the more work gravity must do

Inertia and air resistance increases the force of gravity and thus its work

3. If work by gravity equals the change in potential energy, where does inertia come into play?

The inertia of a falling object equals its potential energy

Inertia is not a factor in work done by gravity

Inertia equals air resistance

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

## Resources and references

Ron Kurtus' Credentials

### Websites

Work by gravity by Sunil Kumar Singh - Connexions

Gravity and Inertia in Running - Locomotion and Biology paper (PDF)

Gravity Resources

### Books

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

## Students and researchers

www.school-for-champions.com/science/
mini-quiz_gravity_work_by_gravity.htm

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