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# Force and motion 8th

TermDefinition
Speed Speed is the change in distance over a specific amount of time.
Speed Formula Speed = distance divided by time s = d/t
Velocity Velocity is speed in a given direction
Acceleration Change in speed or velocity over a specific amount of time, Speeding up, slowing down, change in direction
Balanced Forces Two forces equal in size and acting in opposite directions on an object. No movement
Unbalanced Forces Two forces that are unequal in size and opposite in direction. Movement.
Net Force  The overall forces acting on an object. Measured in Newtons (N)
Force A push or a pull on an object Causes a change in the motion of an object A object’s mass multiplied by acceleration (F=ma)
Friction The force that causes a moving object to slow down when it touches another object. One object rubbing against another
Applied Force A force that is applied to an object by a person or another object. Ex. – A person pushing a box up a ramp Ex. – A bulldozer moving dirt
newton's first law of motion an object at rest will stay at rest AND an object in motion will stay in motion UNLESS an outside force acts on it
newton's third law of motion for every action, there is an equal an opposite reaction
newton's second law of motion the greater the mass of an object, the greater the force needed to accelerate that object
law of conservation of mass mass is neither created nor destroyed; we can demonstrate this with a balanced equation
gravity the force that pulls all objects towards the center of a planet
kinetic energy energy of motion
potential energy stored energy
density formula D= M/V
Simple Machines A simple device for changing the amount or force or direction of force to move an object.
Formula for Work W = f x d Work = force times distance
Newton The SI unit for force (Symbol, N)
Motion An object's change in position relative to a reference point
Created by: KallyEvans