Strength or energy as an attribute of physical action or movement
Force
The force that occurs when a wheel, ball, or cylinder rolls freely over a surface.
Rolling Friction
The friction between layers of a viscous fluid that are moving relative to each other.
Fluid Friction
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.
Weight
A fundamental force of nature that underlies some forms of radioactivity, governs the decay of unstable subatomic particles such as mesons, and initiates the nuclear fusion reaction that fuels the Sun.
Weak Nuclear Force
Newton
When a particle is thrown obliquely near the earth's surface, it moves along a curved path under constant acceleration directed towards the center of the earth.
Projectile Motion
The vector sum of forces acting on a particle or object.
Net Force
The quantity of motion of a moving body, measured as a product of its mass and velocity.
Momentum
The force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
Gravitational Force
The resistance that one surface or object encounters when moving over another.
Friction
Air Resistance
The law that states that within some problem domain, the amount of momentum remains constant; momentum is neither created nor destroyed, but only changed through the action of forces as described by Newton's laws of motion.
Law of Conservation of Momentum
Centripetal Force
The force of friction on an object that is not moving
Static Friction
The force that attracts a body toward the center of the earth, or toward any other physical body having mass.
Gravity
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.
Inertia
A type of physical interaction that occurs between electrically charged particles.
Electromagnetic Force
The force that opposes the movement between two contact surfaces that slide against each other
Sliding Friction
Terminal Velocity
A dimensionless quantity representing the amount of matter in a particle or object.
Mass
The electrical force pushing protons apart and the strong force acting on both protons and neutrons inside of a nucleus.
Strong Nuclear Force