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/s^{2} (ignoring air resistance/friction) (technically 9.8 m/s^{2} 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 t^{2}
formula for work
W=Fd
formula for power
P=W/t (units:watts)
pathagorean theorem formula for resultant vector
a^{2+}b^{2}=R^{2}
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?
45^{o}
tangential speed
speed of something moving in a circular path
rotational speed
refers to the number of rotations per unit time
Newton's 1^{st }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)