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Force and motion 8th
Term | Definition |
---|---|
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 |