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# Chapter 10

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