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AP_Physics_B_-_Newton_s_first_and_second_Law

# AP_Physics_B_-_Newton_s_first_and_second_Law - Unit is the...

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Unit is the NEWTON(N) Is by definition a push or a pull Can exist during physical contact(Tension, Friction, Applied Force) Can exist with NO physical contact, called FIELD FORCES ( gravitational, electric, etc)
INERTIA – a quantity of matter, also called MASS . Italian for “LAZY”. Unit for MASS = kilogram . Weight or Force due to Gravity is how your MASS is effected by gravity. mg W = NOTE:   MASS and WEIGHT are NOT the same thing. MASS never changes When an object moves to a different planet. What is the weight of an 85.3-kg person on earth? On Mars=3.2 m/s/s)? N W N W mg W MARS 96 . 272 ) 2 . 3 )( 3 . 85 ( 94 . 835 ) 8 . 9 )( 3 . 85 ( = = = = =

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An object in motion remains in motion in a straight line and at a constant speed OR an object at rest remains at rest, UNLESS acted upon by an EXTERNAL (unbalanced) Force. There are TWO conditions here and one constraint. Condition #1   – The object CAN move but must be at a  CONSTANT SPEED Condition #2   – The object is at  REST
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