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20 terms

Chapter 10: Forces

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force
a push or pull on an object
newton
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
friction
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
gravity
a force that pulls objects towards each other
weight
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
mass
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
projectile
an object that is thrown
inertia
tendency of an object to resist a change in motion
momentum
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