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Chapter 10
Question | Answer |
---|---|
Force | Push or pull |
Newtons | SI unites |
Net force | Combined forces |
Unbalanced Force | Cause motion, net for is not 0 |
Balanced Force | Same amount of force in opposite directions |
Friction | 2 surfaces exert pressure on each other |
Static | Not Moving |
Sliding | Slide over each other |
Fluid | Solid object moves through liquid |
Rolling | Rolls across a surface |
Gravity | force that pulls objects towards e/o |
Mass | the amount of matter in an object |
Weight | the amount of gravity on an object |
Free Fall | force of gravity alone causes an obj to accelerate |
Air Resistance | fluid friction of air acts on obj falling |
Projectile | an obj that is thrown will fall just as fast as obj dropped, will hit ground at same time. |
Elastic Forces | if it returns to its original shape after it is squeezed or streched |
1st Law of Motion | obj. at rest will stay at rest and obj. in motion will stay in motion unless force acts on it |
Inertia | is the tendency of an obj to resist change in motion. |
2nd Law of Motion | Changes in force and mass = change in ACCELERATION |
Accleration | the rate of change of velocity of an object. |
Action - Reaction Pair | 2 objects exert forces on each other |
3rd Law of Motion | one obj exerts force on a second obj, the second exerts a force equal in the oppo direction |
Momentum | mass x velocity (quantity of motion) |
Law of Conservation of momentum | total momentum of obj that interact does not changeā¦ just transfers from one obj to another |