NEWTON’S LAW OF UNIVERSAL GRAVITATION
NEWTON’S LAW OF UNIVERSAL GRAVITATION QUESTIONS
Name ________________________________________
Period _____________
SHOW WORK! Write the formula first:
1. Find the force of gravitational attraction between a 70 kg student and a 1 kg physics book that are 1 meter apart.
2. The force of gravitational attraction between a 70 kg physics student and the 1.99 x 1030 kg Sun is 0.42 N. What is the average distance between the Earth and the Sun
3. If the force of gravity between the 5.98 x 1024 kg Earth and the Moon is 2 x 10 20 N and the average distance between them is 3.84 x 108 m. How massive is the moon?
FOR THE REMAINING QUESTIONS, PLUG IN SOME “DUMMY” NUMBERS IF YOU NEED HELP SEEING THE RELATIONSHIP.
4. If the mass of one of the objects is doubled, what happens to the force of gravitational attraction?
Example: Starting force: Fg = G*1*1/22= G1/4 = 0.25G
Force where one mass has been doubled: Fg = G*2*1/22= G2/4 = 0.5 G
Therefore, when I double the mass of one of the objects, the force is doubled (0.5 is twice as big as 0.25)
5. If the mass of each object is doubled, what happens to the force of gravitational attraction?
6. If the separation distance between two objects is doubled, what happens to the force of gravitational attraction?
7. If the separation distance between two objects is cut in half, what happens to the force of gravitational attraction?
8. If the separation distance is tripled, what happens to the force of gravitational attraction?
9. Based on your answers above, what can you say the relationship between separation distance and gravitational force is?
10. What is G called and where can you most easily find this value during a test?
11. This gravitational force is the centripetal force that keeps the Earth revolving around the Sun. Why doesn’t the Earth fall into the sun?
12. Are you gravitationally attracted to your pencil? Then why does it not move toward you?
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1) 4.67 x 10-9 N
2) 1.496 x 1011m 3) 7.36 x 1022 kg
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