Name:___________________
Date:___________________
Science, Grade 8
Review of Mass and Weight
Remember that mass is measured in grams and is how much of something
there is. Also remember that weight is the force of an object being pulled to the
Earth by gravity, and is measured in Newtons (N). On Earth, something with a mass
of 100g is pulled by gravity with a force of 1N, and so has a weight of 1N. That also
means, with the help of some math calculations, that something with a mass of 1kg
has a weight of 10N.
On another planet, mass is always the same. If the force of gravity on
another planet is twice the gravity of Earth, then the weight of that object will
double.
Answer the questions below, and remember to show your work for mathematical
questions.
1. On Earth, how much force is needed to lift something with a mass of 100g?
2. On Earth, how much force is needed to lift something with a mass of 200g?
3. On Earth, how much force is needed to lift something with a mass of 1kg?
4. On Earth, how much force is needed to lift 2kg?
5. On Earth, something has a weight of 1N. What is its mass?
6. On Earth, something has a weight of 10N. What is its mass?
7. On Earth, something has a weight of 20N. What is its mass?
8. On Earth, your weight is 600N. What is your mass?
9. If your weight on Earth is 600N, what is your mass on the Moon?
10. On Earth your mass is 55kg. What is your mass on the Moon?
11. Your mass on Earth is 50kg. Planet Zephyr has two times the force of gravity on
Earth. What are your mass and weight on Planet Zephyr?
12. Your mass on Earth is 50kg. Planet Xenon has half the gravitational force of
Earth. What are your weight and mass on Planet Xenon?
13. Your weight on Planet Zeus is 1000N. Your weight on Earth is 500N. How much
stronger is the force of gravity on Planet Zeus than on Earth?
14. Your mass on Planet Cirius is 60kg. The force of gravity is two times stronger
on Cirius than it is on Earth. What is your mass on Earth?
16. Planet Novaland has half the gravity of Earth. On Earth your weight is 680N.
What are your mass and weight on Planet Novaland?
17. On Earth, how much force is required to lift an object that has a mass of 5kg?
If Planet Sodo has twice the force of gravity found on Earth, what is the force
required to lift that object on Planet Sodo?