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2015 Sem1 SCIENCE
FORCES : Sections 1 - 5
Term | Definition |
---|---|
force | a push or pull exerted on an object |
newton (N) | a unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second |
net force | the overall force on an object when all the individual forces acting on it are added together |
unbalanced forces | forces that produce a nonzero net force which changes and object's motion |
balanced forces | equal forces acting on an object in opposite directions |
friction | the force that one surface exerts on another when the two surfaces rub against each other |
static friction | friction that acts on objects that are not moving |
sliding friction | friction that occurs when one solid surface slides over another |
rolling friction | friction that occurs when an object rolls over a surface |
fluid friction | friction that occurs as an object moves through a fluid |
gravity | the force that pulls objects toward each other |
mass | the amount of matter in an object |
weight | the force of gravity on an object at the surface of a planet |
free fall | the motion of a falling object when the only force acting on it is gravity |
air resistance | the fluid friction experienced by objects falling through the air |
terminal velocity | the greatest velocity a falling object can achieve |
projectile | an object that is thrown |
inertia | the tendency of an object to resist any change in its motion |
momentum | the product of an object's mass and velocity |
law of conservation of momentum | the rule that in the absence of outside forces the total momentum of objects that interact does not change |
satellite | any object that orbits around another object in space |
centripetal force | a force that causes an object to move in a circle |