# Unit 4 Gravity

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1. What does force depend on
upon? 2 things
force depends both upon mass a thing has and upon how much acceleration you want it to go .
2. What is speed measured in
meters per second
3. what is acceleration measured in
meters per second per second
4. Who was puzzled by things falling down
Issac Newton
5. What did Newton realize?
all objects are attractive towards another
6. What is the approximate rate of acceleration at which things fall?
10 m/s2
7. What must you do when you hold the apple? and what do we call this force needed
balanced gravity force. called support force
8. Why does it see like all things are attracted to the Earth ?
because earth is big enough
9. define the term vacuum
is a condition where there is no air
10. What does gravity depend on ?
depend on the mass of the object and the distance between them
11. Tell the difference between mass and weight
• Mass is the amount of matter in an object.
• Weight is the measure of the gravitational force between two objects
12. What is gravity
is an attractive force between two objects
13. What is the gravitational force between two masses m and m.
is proportional to the product of the masses and inversely proportional to the square of the distance r between them
14. When does gravity get weak
gets weaker with distance
15. what does the number G in the formula
W=mg and how do you measure G
is a constant of nature that indicates how strong the gravitational force is.

To measure G, you would have to perform an experiment to measure the attraction between two known masses.
16. What does the moon fall slower than an earth ground apple.
the effect of this inverse square is the tide, the twice daily rise and fall of ocean water
17. What do tides occur?
because gravity gets weaker with distance
18. What is the unit of mass
kilogram
19. What unit do we measure weight in
newtons
20. What are the four basic forces?
• gravity
• electromagnetism
• the subatomic weak force
• the strong nucleus holding the atomic nucleus together
21. define electromagnetism
the attraction & repulsion of electrically charged bodies
22. What one of the four basic forces do we feel
electromagnetism
23. When you push the wall and it pushes back what are you feeling
electric repulsion between atoms.
24. When gravity act alone what are you in
free fall where you feel no force
25. What is the gravitational force on people
26. What can you do to weight less
• go on a diet
• be on the moon
• farther from the earth up on the roof and you would weight less
27. how does weight vary
• according to where you are in deep space
• your weight might be zero, but your mass is the same wherever you go
28. what is the force earth exerts on you
w=mg
29. what does mass measure
• how much gravity it exerts on other objects
• how much it resists acceleration
• how much inertia it has
30. A question of inertia is really a question of what
mass
31. how do mass and inertia relate
the more mass the more inertia
32. does mass depend on volume
no
33. what is mass measured in
grams
34. is mass affected by gravity
no
35. how does mass and weight relate
are directly proportional to each other . if one doubles the other doubles
36. what law tells us how to convert between mass and weight
newtons 2nd law F=ma
37. Can you ever be truly weightless
no . No matter where you go there is always gravity
38. The feeling of weightless is due to the fact that you are in
free fall
39. What is gravity
is the attraction of one object to another
40. When does gravity occur
when molecules of one object pull on molecules of another object
41. Where does gravity pulls things
pull things together toward the center
42. What kinds of object have gravity
anything with mass has gravitational pull/force
43. What is the universal law of gravitation
all objects in universe experience gravitational attraction
 Author: jennx14 ID: 208457 Card Set: Unit 4 Gravity Updated: 2013-03-20 04:16:44 Tags: Science Folders: Description: Gravity Show Answers: