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PHYSICS (MOMENTUM
& IMPULSE &
MOTION (CONSERVATION OF MOMENTUM…
PHYSICS
NEWTONS LAWS
FORCES
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Frictional force (f): the force that opposes the motion of an object in contact with a surface and it acts parallel to the surface the object is in contact with.
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LAWS
1st law: a body will remain in its state of motion (at rest or moving at constant velocity) until a net force acts on it
Passengers traveling same speed as car. When car stops, passengers keep traveling same speed according to Newton's first law. If they are wearing seat belts, the seat belts will stop them by exerting a force on them and so prevent them from getting hurt.
2nd law: when a net force acts on an object, the object will accelerate in the direction of the force and the acceleration is directly proportional to the force and inversely proportional to the mass of the object
Fnet = ma
1) draw problem
2) choose system; 1 box, person, etc.
3) identify ALL forces on system
4) draw free body diagram
5) choose reference direction
6) write 2nd law: Fnet = ma
7) write equations and substitute
3rd law: when one body exerts a force on a second body, the second body exerts a force of equal magnitude in the opposite direction on the first body
Fnet = -Fnet
Law of Universal Gravitation: each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers
F=(Gm1m2)/r2
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