Forces

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Friction

a force that opposes the motion of objects that touch as they move past each other

Static Friction

is the friction force that that acts on the objects that are not moving

Sliding Friction

is a force that opposes the direction of motion of an object as it slides over a surface

Rolling Friction

the change in shape at the point of rolling contact

Fluid Friction

opposed the motion of an object through a fluid

Air resistance

fluid friction acting on an object moving through the air

Terminal velocity

the constant velocity of a falling object when the force of air resistance equals the force of gravity

Projectile Motion

the motion of a falling object after its given an initial forward velocity

Inertia

the tendency of an object to resist change in its motion

Mass

a measure of the inertia of an object that depends on the amount of matter the object contains

Momentum

the product of an objects mass and its velocity

Law of Conversation of Momentum

if no net forces acts on a system, then the total momentum of the system does not change

Electromagnetic Force

associated with the charged particles

Strong Nuclear Force

a powerful force of attraction that acts only on the neutrons and protons in the nucleus, holding them together

Weak Nuclear Force

is an attraction force that acts only over a short range

Gravitational Force

an attraction force that acts between two masses

Centripetal Force

a center-directed force that continuously changes direction of an object to make it move in a circle