Motion
when the distance between two objects is changing
velocity
Speed in a given direction
Acceleration
change in velocity
force
a push or pull on an object
Newton
a unit of measure that equals the force required to accelerate.
Friction
the force that two surfaces exert on each other when they rub against each other
net force
The overall force on an object when all the individual forces acting on it are added together
Mass
the amount of matter in an object
inertia
the tendency in an object to resist change in motion
weight
A measure of the force of gravity acting on an object
Gravity
the attraction force between objects; the force that moves objects downhill
magnetism
The force of attraction or repulsion of magnetic materials
magnetic field
the region around a magnet where the magnetic force is exerted
electric field
the force between charged objects where object's electric force is exerted on other charged objects
electrical force
The force between charged objects