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a push or pull on an object


the strength of a force measured in the SI system

net force

the combination of all of the forces acting on an object

unbalanced forces

result in a net force that causes a change in a object's motion

balanced forces

equal forces acting in opposite directions


the force that two surfaces exert on each other when they rub against each other; acts opposite the direction of motion

static friction

the friction that acts on objects that are not moving; acts opposite the direction of motion

sliding friction

occurs when two solid objects slide over each other; acts opposite the direction of motion

rolling friction

occurs when an object rolls over a surface; acts opposite the direction of motion

fluid friction

occurs when a solid object moves through a liquid; acts opposite the direction of motion


a force that pulls objects towards each other


force of gravity acting on the a person or object at the surface of the planet

free fall

occurs when the only force acting on an object is the force of gravity


a measure of the amount of matter in an object

air resistance

an upward force exerted on all falling objects

terminal velocity

the greatest velocity a falling object reaches


an object that is thrown


tendency of an object to resist a change in motion


characteristic a moving object that is related to the mass and velocity of the moving object

law of conservation of momentum

the total momentum of objects that interact does not change

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