The state where forces on an object (or system) are balanced, there is no acceleration, and velocity of the object (or center of mass of the system) remains constant
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Newton's 1st law (inertia)
Front
All objects remain in a constant state of motion, either at rest or moving with a constant speed in a straight line, unless they are acted on by an unbalanced force
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Free fall
Front
The state where the only force acting on an object is the force of gravity (air resistance is negligible)
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Gravitational Mass
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The property of an object that affects the amount of gravitational attraction to other objects
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Normal Force
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The repulsive force between the surfaces of any 2 objects; it is the result of electrons in the surface of the 2 objects repelling each other
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iv.
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Weight is the amount of gravitational force on an object; weight is the product of an object's mass times the gravitational field strength of the point in space where the object is located: w=m x g
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Acceleration
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"The rate of change in velocity"; an objects accelerates when it changes its speed and/or direction
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iii.
Front
For any object, its inertial mass and gravitational mass have been experimentally verified to be identical in quantity
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Inertial Mass
Front
The measure of an object's resistance to a change in motion; it affects how the object's motion will change when it interacts with other objects