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# Forces

TermDefinition
force a push or pull that causes a change in motion
applied force a physical push or pull between two objects or people
friction the force that opposes motion and causes objects to slow down
gravity attractive force between any two objects that cause mass
air pressure forces applied by a moving gas
electromagnetic force the force between charged objects
centripetal force force that makes objects spin or change direction
buoyancy fluid force on objects to make them float
lift upward force of air that causes objects to rise when moving at a high rate of speed (airplanes and helicopters)
magnitude the strength of a force
Newtons the unit for force
vector an arrow used in a free-body diagram and tells you the magnitude and direction of a force
net force the total or resulting force acting on an object
normal force the support force caused by a surface against an object
Newton's First Law of Motion an object stays in motion or stays at rest unless acted on by an unbalanced force
Newton's Second Law of Motion the mass of an object is directly proportional to the force applied on it and inversely proportional to its acceleration (F=ma)
Newton's Third Law of Motion every action has an equal but opposite reaction
inertia an object's resistance to changing its motion
acceleration due to gravity the rate at which objects accelerate toward the Earth when the force of gravity pulls on them (9.8 m/s2)
weight the force produced by an object's mass due to gravity (Fw=mg)
mass how much matter is in an object
static friction when two objects are touching each other but the force of friction is preventing movement
air friction (drag) the force that slows down an object when it is falling and cutting through the air
sliding friction when two objects are moving past each other but with some resistance
viscous friction friction created by a liquid running over a surface
rolling friction created by one object rolling over another
momentum mass in motion and how hard it is to make an object stop
Created by: holtzmanscience