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Force
A force is a mechanical interaction between two objects or bodies.
Inertia
Inertia is the tendency of an object to resist changes in its motion.
Mass
The amount of material in a body or object.
Newton's First Law of Motion
Newton's first law states, "An object remains at rest or continues to move at constant velocity unless acted on by an external resultant force."
Newton’s Second Law
Newton’s Second Law of Motion states that the resultant force on an object is equal to the mass of the object multiplied by its acceleration.
Newton’s Third Law
When object A exerts a force on object B, object B exerts an equal-magnitude force on object A in the opposite direction.
Resultant Force
The single force that has the same effect as all the forces acting together on an object (the **vector sum** of forces).
Weight
The gravitational force acting on an object due to a gravitational field.