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# Forces

### Review of Forces

anything that can cause an object to change its motion (accelerate) force
law that says Force= mass times acceleration (F=ma) Newton's 2nd law of motion
when forces acting on an object are equal and opposite balanced
the sum of all forces acting on object net
F = Gm1m2/ d^2 Universal gravitation equation
force that always opposes motion friction
SI unit for force and weight Newtons ( N )
SI unit for mass kilograms ( kg )
SI units for acceleration ( m/s^2 ) or ( m/s/s )
the tendency of an object to continue its motion (or stay at rest) inertia
type of friction that works on stationary objects (at rest) static
type of friction that works on moving objects (in motion) kinetic
the path of motion of any projectile curved
force that always causes a downward acceleration gravity
when only force acting on falling object is gravity free fall
mass times velocity momentum (p)
a falling object reaches this constant (max) speed when gravity and air resistance is equal terminal velocity
when 2 objects hit each other collision
this says that for every force there is an equal and opposite force Newton's 3rd law of motion
this says that an object in motion will stay in motion until acted on by a net force Newton's 1st law of motion
when object and its surrounding s are both in free fall apparent weightlessness
the amount of matter an object has mass
measure of gravity's pull on an objects matter weight
SI unit for momentum kg * m/s
quantity that is magnitude only scalar (ex. speed, mass and weight)
quantity that is both magnitude and direction vector (ex. acceleration , velocity, momentum

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