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# Forces Vocabulary

### Vocal words

Momentum The product of an objects mass and it's velocity
Formula for momentum M=pv
Law of conservation of momentum The total momentum of any group of objects remains the same unless outside forces also act on the objects
Force A push or a pull that gives energy to an object
Units of force Forces are measured in newtons;N
Net force The total or all the forces acting on an object
Inertia The tendency of matter to resist a change in it's motion
Balanced forces The net force acting on an object is zero
Unbalanced forces The net force acting on an object is not zero
Magnitude The amount in size of measurement
Friction A force that one Surface exerts on another when the two surfaces are in contact with each other
Static friction Friction between non moving objects
Kinetic friction Friction between moving objects
Sliding friction Friction between objects that slide
Rolling friction Occurs when an object rolls over a surface
Fluid friction Occurs when an object moves through a fluid or a gas
Newtons first law of motion Objects at rest will stay at rest & objects in motion will stay in motion at a constant velocity unless acted on by an unbalanced force
Newtons second law of motion The net force acting on an object is equal to the product of the objects mass and acceleration
Newtowns third law of motion For every action force there is a reaction force that is equal, but acts in the opposite direction
Law of universal gravitation All objects in the universe are attracted to each other; strength of attraction depends on the objects masses and distances from each other
Freefall The motion of an object when gravity is the only force acting on it
Terminal velocity Greatest velocity of a falling object; occurs when the force of gravity is equal to the force of friction
Weight A measure of a force of gravity on an object
Mass The amount of matter in something
Centripetal force The force that is pulling an object in circular motion towards the center of the circle
Geosynchronous orbit Occurs when an object orbits another object and at a rate equal to the 2nd objects rate of rotation
Created by: Bridgetteg