Solving for Mass

​Mass= Force/Gravity

A bowling ball fell from a bridge with 490N of force. What is the mass of the bowling ball?
Force= 490N

Mass=?
Gravity= 9.8m/s/s Mass= 490N / 9.8m/s/s = 50kg

Solving for Weight

​Weight= Mass x gravity

What is the weight of an object (on earth) that has a mass of 64kg?

Mass= 64kg

Gravity= 9.8m/s/s

Weight=?

Weight= 64kg x 9.8m/s/s = 627N

Notice

Notice how the formula for solving for Force and solving for weight is the same. But also, notice how if an astronaut goes to the moon, his mass remains the same but his weight decreases. This is because he got further away from earth, the acceleration of gravity decreases.

How Much do you Weigh?

​1 kilogram = 2.2 pounds

To find your mass in kg, take your weight in pounds and divide by 2.2

Example: My mass is 200 pounds, so I would divide 200/2.2 = 90.9kg

My mass on the moon (Grav= 1.6) would still be 90.9kg but my weight would be 145.4N

Page 24 in your Packets

​Complete page 24 in your packet

Make sure adjust your answers based on the gravity of each planet.