Motion

Question 0

Gravity

Answer 0

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.

Question 1

Force

Answer 1

strength or energy as an attribute of physical action or movement.

Question 2

Law of universal gravitation

Answer 2

a law stating that any two masses attract each other with a force equal to a constant

Question 3

Mass

Answer 3

a body of coherent matter, usually of indefinite shape and often of considerable size

Question 4

Weight

Answer 4

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.

Question 5

Inertia

Answer 5

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.

Question 6

Newton’s first law

Answer 6

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.