8.7B 8th Grade Science (STAAR)

Newton's first law

Unless otherwise acted upon,an object in motion stays in motion;an object a trest stays at rest

Newton's Second law

An object will accelerate in the direction of a force acting upon it

Newton's Third law

Forces always occur in equal or opposite pairs

Force

push or pull;always involves 2 or more objects

Netforce

Sum of all the forces acting on a object

Newtons

the unit used to measure

Unbalanced force

Any push or pull where the net force is not zero

Gravity

a non-contact force that acts between any two objects

Acceleration

Any change in velocity,including speed ups,slowdowns and turns

friction

A force that slows or stops motion when objects rub together

gravity

A force of attraction between objects that is due to their masses

inertia

An object in motion will stay in motion and object at rest will stay at rest; newton's first law

motion

A change in position over time

speed

Distance/Time

velocity

Speed and direction

Isaac newton

Defined the laws of motion and gravity. Tried to explain motion of the universe.