# Mini-Quiz: Work Against Gravity to Lift an Object

by Ron Kurtus (revised 27 June 2013)

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

1. How much force is needed to project an object upward at a constant velocity?

More than its weight

Equal to its weight

Less than its weight

2. Why must inertia be taken into account when lifting a stationary object?

It is only a factor when dropping an object

Inertia is required if the object is very heavy

Resistance from inertia comes when the object accelerates from zero to some velocity

3. Why is air resistance a factor in projecting a rocket upwards?

It is only a factor if the force from gravity becomes zero

High velocities greatly increases the air resistance force

It is needed for the rocket to return to Earth

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.

Work toward your goals

## 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

## Questions and comments

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