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# force and motion

Across
forces that cancel each other out when acting together on a single object
friction that occurs as an object moves through a fluid
the force with which an object responds to an action as in Newton's third law of motion
the combination of all forces acting on an object
the force of attraction between all masses in the universe
The speed and direction of a moving object
Force is mass times acceleration; an objects acceleration depends on the mass of the object and the size and direction of the force acting upon it
Every action force has an opposite, and equal reaction force
an object at rest will stay at rest; an object in motion will stay in motion; unless acted by an outside force
A change in velocity
friction between non-moving surfaces
A push or pull that acts on an object
Down
How fast an object's position is changing with time at any moment
friction that occurs when one solid surface slides over another
Opposes the motion of one object moving past another
friction between moving surfaces
forces that do not cancel each other out when acting together on a single object
The tendency of an object to resist a change in its state of motion
an object's change in position relative to a reference point
the SI unit of force
the force one object applies to a second as in Newton's third law of motion