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# Physics ch. 16-17

### Motion and force

TermDefinition
motion distance from another object is changing
reference point a place or object used for comparison
SI international system of units (metric system)
speed the distance an object travels in a certain amount of time
speed formula S=D/T
velocity speed and direction of an object
acceleration the process of increasing speed, decreasing speed or changing direction
acceleration formula A=final speed-initial speed/ time
force a push or a pull
newton the SI unit of measurement for force
unbalanced force causes an object to move
balanced force an object will not move because there is equal pressure applied in both directions
friction the force applied when two surfaces rub against each other
static friction friction that acts on an object that is not moving
sliding friction friction that occurs when two solid surfaces slide over each other
rolling friction friction that occurs when an object rolls across a surface
fluid friction friction that occurs when a solid object moves through a fluid
gravity a force that pulls objects towards each other
mass the measure of the amount of matter in an object
weight the measure of the gravitational force exerted on an object
free fall when the only force acting on an object is gravity
air resistance objects falling through air experience this type of fluid friction
terminal velocity the fastest something can fall
Inertia the tendency of an object to resist a change in motion
Newtons first law an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force
Newtons second law force equals mass times acceleration
Newtons third law for every action there is an equal and opposite reaction
momentum formula momentum=mass x velocity
Law of conservation of momentum the total momentum does not change in a collision unless acted upon by an outside force.
Created by: Todd.devlieger