Gravity
The pulling force exerted on every object by every other object
Acceleration
Any increase to the "rate of change" in an object's velocity which results in an increase in the object's speed
Deceleration
A decrease in the "rate of change" in an object's velocity which results in a decrease in speed and is synonymous with the term "negative acceleration
Net force
Exists when the forces acting on an object are unequal or unbalanced
Balanced force
Forces acting on an object that are equal in size and opposite in direction
Kinetic energy
Energy possessed by an object due to its motion, mass and velocity
Potential energy
Energy possessed by an object due to its mass, position or condition
Thermal energy
The total amount of kinetic energy in the particles of a substance
Inertia
The property of matter that resists changes in speed and direction
Newton
Standard unit of measure which identifies the amount of a particular force acting on an object
Friction
Force that opposes motion between two surfaces in contact with each other. Works in the opposite direction of motion and can produce tremendous heat.
Velocity
The speed and direction of a moving object