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inertia The property of things to resist changes in motion.
Law of Inertia Every object continues in a state of rest or of uniform speed in a straight line unless acted on by a non zero net force.
Force a push or pull
Net force the vector sum of forces that act on an object
mechanical equilibrium the state of a object or system of objects for which there are not changes in motion
equilibrium rule for any object or system of objects in equilibrium, the sum of the forces acting equals zero.
vector quantity a quantity of force with direction and magnitude
tension the pulling force exerted by a cable, chain or other continous object.
weight the force due to gravity
support force the upward force that equals the downward force of gravity on a stationary object. Also called normal force.
speed how fast something moves; the distance traveled per unit of time
instantaneous speed the speed at any instant
average speed the total distance traveled divided by the time of travel
velocity the speed of an object and a specification of its direction of travel
scalar quantity quantity that can be described by magnitude without direction
acceleration the rate at which velocity changes with time ; the change in velocity may be in magnitude or direction or both.
free fall motion under the influence of gravity only
resultant the sum of two or more vectors
parallelogram rule the diagonal of a parallelogram shows the resultant
Created by: lpgullett