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Forces Intro
REview of forces
Question | Answer |
---|---|
force | anything that can cause object to accelerate |
speed up, slow down, or change direction | 3 ways to accelerate |
1st law of motion | "an object in motion tends to stay in motion, until acted on by a net force" |
2nd law of motion | Force = mass x acceleration |
3rd law of motion | "for every force there is an equal and opposite force" |
inertia | tendency of object to continue its motion ; resist a change in motion |
contact force | force that must touch object to act on it |
friction, tension, spring (examples of...) | examples of contact forces |
field force | force that acts from a distance; does not have to touch object it acts on |
gravity, magnetic, electric (examples of...) | examples of field forces |
Newtons (N) | SI unit for force and Weight |
balanced forces | these forces cause no change to object's motion |
Normal force | perpendicular contact force that is upward if object is on a horizontal surface |
Tension force | upward force if object it suspended by a string |
friction | force that always moves in the opposite direction as object's motion |
net force | sum of all of the forces acting on an object |
Free Body Diagram | illustration of all the forces acting on an object |
Air resistance | upward force if object is falling through the air |
static friction | friction that acts on stationary objects |
kinetic friction | friction that acts on moving objects |