# Physics

 What did Galileo find in his experiment on the Leaning Tower of Pisa? Mass does not matter (mass does not affect the amount of time it takes for an object to hit the ground.) Inertia the property of a moving object to continue moving (if object has inertia it will continue moving forever) Velocity measure of both speed AND direction Acceleration the rate of change in velocity formula for acceleration a=(change in) v/(change in) t formula for velocity in free fall v=gt formula for velocity on a surface (horizontal) v=(change in) d/(change in) t acceleration in free fall (on earth) 10m/s2 (ignoring air resistance/friction) (technically 9.8 m/s2 with air resistance/friction) free fall occurs when an object is free of all restraints and falls under the influence of gravity alone distance formula d=1/2 g t2 formula for work W=Fd formula for power P=W/t (units:watts) pathagorean theorem formula for resultant vector a2+b2=R2 vector any quantity that requires both magnitude ( value) and direction scalar a quantity that can be described by magnitude alone projectile any object that is projected by some means and continues in motion under the influence (something you throw once it is out of you hand) Trajectory the path a projectile takes which angle will go the farthest if you project something at that angle? 45o tangential speed speed of something moving in a circular path rotational speed refers to the number of rotations per unit time Newton's 1st Law of Motion evey object continues in its state of rest or in uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it (objects in motion stay in motion, objects at rest stay at rest unless acted upon by an outside force) Newton's 2nd Law of Motion The acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object. (a~F, 1/2a=2xm) Newton's 3rd Law of Motion Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. (for every action there is an equal and opposite reaction) Force fomula (2nd law) F=ma acceleration formula(2nd law) a=F/m Potential energy formula PE=mgh Kinetic Energy formula KE=1/2 m v2 efficiency formula efficiency=useful energy out/total energy in (%) Fulcrum problems fomula Fd(in)=Fd(out) Authorphoenixbird56 ID113761 Card SetPhysics Descriptionhuge test thursday :) Updated2011-11-01T22:37:18Z Show Answers