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14 terms

The world of Motion and Forces

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Reference point
A place or object used for comparison to determine if an object is in motion
Motion
an object's change in position relative to a reference point
Speed
the rate at which an object moves (distance divided by time)
Magnet
a device that attracts iron and produces a magnetic field
Friction
the force that one surface exerts on another when the two rub against each other
Gravity
attractive force between two objects that depends on the masses of the objects and the distance between them
Force
a push or pull that acts on an object
Inertia
the tendency of a body to maintain its state of rest or motion unless acted upon by an external force
Velocity
the speed and direction of a moving object
Acceleration
the rate at which velocity changes.
Newton's 1st Law of Motion
An object at rest/motion will remain at rest/motion until acted upon by an outside force
Newton's 2nd Law of Motion
Force = Mass x Acceleration (F = ma)
Newton's 3rd Law of Motion
For every action there is an equal and opposite reaction
position
the location of a place or an object