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### 30 Cards in this Set

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 Motion occurs when an object changes its position relative to its surroundings. distance an object travels is the space between two points. frame of reference motion is observed and meassured any set of point,lines,or planes from which coordinates can be measured speed of an object is the distance the object travels in a given time average speed s=d/t s=100m/20s s=5m/s instantaneous speed the speed of an object at a particular instant velocity is speed in a particular direction acceleration the rate at which the velocity of an object changes a=cv/t=Fv-iv/t a=15m/s-0m/s/8s a=1.9m/s2 inertia is the tendency of an object to resist any change in motion net force is the sum of the force acting on an object net force=mass x acceleration f=m x a f=1n acceleration due to gravity in the absence of air resistance, however, all freely falling objects have the same acceleration FREE FALL WHEN gravity is the only force acting on a falling object weightless freely falling object momentum is = to an object's mass multipled by its velocity p=m x v p=___kg x m/s projectile motion is the motion of an object thats move under the influence of gravity alone trajectory the curved path a projectile follows uniform circular motion refers to motion with constant speead around a circle centripetal force force that causes an object to move in a circle work IS DONE WHEN WHEN A FORCE MOVES AN OBJECT OVER A DISTANCE W+ F X D joule one j equals a force of 1n moving an object a distance of i m. a joule is = to n x m w=f x d w=___j energy the ability to do work potential energy stored energy gravitational potential energy potentia energy due to an object's positions relative to the ground kinetic energy is the energy of motion kinetic energyy = 1/2 mass x speed2 ke=1/2mv2 laws of conservation of energy that energy can be changed from one form to another, the total amount stay the same power is the rate at which work is done power = work/time p=w/t p=___w watts a watt is equal to a joule per second (j/s) machine any tool that help to do work simple machine is one that does work in one movement lever is a rod or bar that pivits around a point