Q2 Nine Weeks

1. friction friction that occurs when an object moves through a fluid such as air or water
6. fall motion of an object when gravity is the only force acting on it
7. the tendency of an object to resist changes in its motion
8. the amount of matter in an object
11. the force of attraction between objects with mass
15. the force of gravity acting on an object
16. velocity the constant speed reached when air resistance equals the force of gravity
17. forces forces acting on an object that are equal in size and opposite in direction resulting in no change in motion
18. force the overall force acting on an object after all forces are combined

2. forces forces that cause a change in motion because they do not cancel out
3. a force that opposes motion between two surfaces that are touching
4. friction friction that occurs when two surfaces slide past each other
5. an object that is thrown or launched and moves through the air under the influence of gravity
9. friction friction that prevents an object from starting to move
10. the SI unit used to measure force
12. friction friction that occurs when an object rolls over a surface
13. a push or pull acting on an object
14. resistance a type of fluid friction that opposes motion through the air