energy
the ability to do work
motion
a change in position
kinetic energy
energy of motion
potential energy
stored energy
generator
a device used to convert mechanical energy to electrical energy
Law of Conservation of Energy
energy cannot be created or destroyed
elapsed time
the length of time that passes from one event to another
speed
the rate at which the position of an object changes
distance
the length of a path between two points
force
a push or a pull
velocity
the speed and direction in which an object is moving
acceleration
the rate of change of velocity
friction
a force that opposes motion and that occurs when things slide or roll over eachother
inertia
the tendency of an object to resist changes in motion
Newton's 1st Law of Motion
n object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force
Newton's 2nd Law of Motion
the acceleration of an object depends on the mass of the object and the amount of force applied
Newton's 3rd Law of Motion
for every action there is an equal and opposite reaction
gravity
the force of attraction between any two objects that have mass
Law of Universal Gravitation
gravitational force depends on the mass of the two objects involved and on the distance between them