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# Forces + Motion laws

### Review of forces and laws of motion

anything that can cause an object to accelerate force
the sum of all the forces acting on an object net force
the amount of matter an object has mass
the amount of space an object takes up volume
measure of gravity's pull on object's mass weight
SI unit for force and weight Newtons ( N )
SI unit for momentum kg * m/s
SI unit for acceleration m/s^2 ( m/s/s )
tendency of object to continue its motion inertia
Law of motion: Fnet = ma 2nd
Law of motion: for every force there is an equal and opposite force 3rd
Law of motion: object in motion tends to stay in motion until acted on by a net force 1st
force that always acts in the opposite direction as motion friction
the max and constant velocity of free falling body due to gravity and air resistance being equal terminal
anything that has been thrown, launched, shot , etc... projectile
path of motion of projectiles curved
the motion of an falling object that only has gravity acting on it free fall
friction that acts on objects at rest static
friction that acts on moving objects kinetic
when an object and its surrounding are both in free fall apparent weightlessness
describes that acceleration due to gravity constant and negative (downward)
F = Gm1m2 / d^2 Universal Gravitation equation
relationship between inertia and mass directly proportional
in UGE , the relationship between force and distance inversely proportional
mass x velocity momentum ( p )
quantity that has magnitude only scalar (ex. mass, weight, speed)
quantity that has both magnitude and direction vector (ex. acceleration, velocity, momentum, force)
SI unit for mass kilograms (kg)