acceleration
The rate at which velocity changes
force
A push or a pull
Newton
SI unit of force
Velocity
Speed in a given direction
speed
The distance an object travels per unit of time
direction
the path that a moving object follows
friction
The force that two surfaces exert on each other when they rub against each other
sliding friction
occurs when 2 solid surfaces slide over each other
fluid friction
occurs when a solid object moves through a fluid
rolling friction
when an object rolls across a surface
gravity
A force that pulls objects toward each other
mass
a measure of the amount of matter in an object
kilograms
SI unit of mass
weight
A measure of the force of gravity on an object