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20 Cards in this Set

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  • Back
air resistance
th eopposing force created by objects moving through air
equilibrium
when forces in an object are balanced
force
a push, a pull, or any action that has the ability to change motion
friction
the force that results from relative motion between objects
gravity
the attractive force that exists between any two objects that have mass
inertia
the reluctance of a body to change its state of motion
law of conservation of momentum
as long as interacting objects are not influenced by outside forces, their momentum before the interaction will equal their momentum before the interaction
mass
a measure of the inertia of an object; the amount of matter in an object
momentum
mass times velocity
net force
the amount of force that overcomes another force to cause motion
-force can be 0 if they are equal
newton
unit of force
N
Newton's 1st Law of Motion
an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force
Newton's 2nd Law
acceleration of an object is proportional to the force acting on it and inversely proportional to its mass
Newton's 3rd Law
every action has an equal and opposite re-action
pounds
English system's unit of force
sliding friction
resistance created when two surfaces rub against each other
weight
a force created by gravity
difference between mass and weight
mass never changes
weight does
rolling friction
resistance created when one object rolls over another
viscous friction
resistance created by objects moving in water or other fluid