AP Physics C: Mechanics : Calculating Weight

Example Questions

Example Question #1 : Calculating Weight

The force on an object due to gravity on the moon is one-sixth of that found on Earth. What is the acceleration due to gravity on the moon?

Explanation:

We can use Newton's second law:

Set up equations for the force on the moon and the force on Earth:

Now we can use substitution:

From this, we can see that . Using the acceleration due to gravity on Earth, we can find the acceleration due to gravity on the moon.

Example Question #1 : Calculating Weight

A large planet exerts a gravitational force five times stronger than that experienced on the surface of Earth. What is the weight of a 50kg object on this planet?

Explanation:

The weight of the object on Earth's surface is:

The force on the new planet is five times that on Earth, so we can simply multiply:

Example Question #31 : Forces

A space woman finds herself in an unkown planet with gravity . If her weight on Earth is 500N, what is her weight on the unkown planet?