1. True
2. The force that one surface exerts on another when the two rub against each other.
3. opposite
4. The two factors are types of surfaces involved and how hard the surfaces push together.
5. rolling friction
6. reducing friction? Iono..
7. gravity
8. 9.8 m/s©÷ 32.2 ft/s©÷
9. projectile
10. False
11. air resistance
12. True
13. The force of gravity on a person or object at the surface of a planet.
14. Weight is a measure of the force of gravity on an object, and mass is a measure of the amount of matter in that object.
15. True
16. False
17. a) mass b) distance
18. If one object exerts a force on another object, then the second object exerts a force of equal magnitude in the opposite direction on the first object.
18. opposite ? iono..
19. momentum
20. It states that the total momentum of the objects that interact does not change.
21. when the cue ball hits another pool ball the momentum is conserved by taking the momentum from the cue ball and transferring it into the pool ball to cause it to move ? iono..