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Forces8th
Forces8th vocab
Question | Answer |
---|---|
Momentum | the product of an object's mass and its 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 of pull that gives energy to an object |
Units of forces | forces are measured in Newtons; N |
net force | the total of all the forces acting on a object |
inertia | the tendency of matter to resist a change in its 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 of a 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 object |
Kinetic Friction | Friction between moving objects |
Sliding Friction | friction between objects that slide (rub) against each other |
Rolling Friction | Occurs when an object rolls over a surface |
Fluid Friction | Occurs when an object moves through a fluid or a gas |
Newton's 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 |
Newton' s Second Law of Motion | The net force acting on an object is equal to the product of the object's mass & acceleration |
Newton's 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 distance from each other |
Freefall | The motion of an object when GRAVITY is the only force acting on it |
Terminal Velocity | Greatest velocity of a fslling object; occurs when the force of GRAVITY is EQUAL to the force of FRICTION |
Weight | A measure of the 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 towardss the center of the circle |
Geosynchronous Orbit | Occurs when an object orbits another object at a rate equal to the 2nd object's raate of rotation |