Motion Flashcards
Gravity
the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton’s laws of gravity apply, with minor modifications to take the general theory of relativity into account.
Force
strength or energy as an attribute of physical action or movement.
Law of universal gravitation
a law stating that any two masses attract each other with a force equal to a constant
Mass
a body of coherent matter, usually of indefinite shape and often of considerable size
Weight
a body’s relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.
Inertia
a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
Newton’s first law
An object that is at rest will stay at rest unless an external force acts upon it. An object that is in motion will not change its velocity unless an external force acts upon it.