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The speed an object is traveling at any one moment (instance) in time.
Instantaneous speed
When an object changes its position over time.
Motion
The ability (or capacity) to do work.
Energy
The resistance to motion that a surface or object encounters when moving over another. The amount may depend on texture, shape, speed, weight, and wetness of the surface or object.
Friction
The branch of science that deals with the structure of matter and how the fundamental properties of the universe (matter and energy) interact.
Physics
A force that requires two pieces of matter to touch.
Contact force
The push or pull on an object and a transfer of energy. A change to the object always occurs.
Force
Distance traveled divided by the time it takes to travel that distance.
Average speed
Quantity of motion of a moving object. Calculated as mass times velocity. Part of Newton's Second Law of Motion.
Momentum
The ability of an object to resist a change in its motion. Part of Newton's First Law of Motion.
Inertia
When a force causes an object to move in the same direction as the force.
Work
The change in velocity divided by the time it takes for that change to happen. It's called deceleration if it's in a backwards direction.
Acceleration
The speed that an object is traveling and the direction that object is traveling in.
Velocity
A force that acts at a distance. Examples are gravity, electricity, and magnetism.
Non-contact force
When once force exerts more force than another.
Unbalanced force
A set of universal principles that describe the relationship between an object's motion and the forces acting upon it. Help explain everyday life. Also known as Newton's Laws of Motion.
Classical mechanics
Motions of objects without reference to force.
Kinematics
The combination of all forces acting on an object. Part of Newton's Third Law of Motion.
Net force
The forces cancel each other out. The net force is always zero.
Balanced force
A word that describes direction. Calculated by subtracting the initial position (starting point) from the final position (ending point).
Displacement