Force
a push or pull that acts on an object
Newton
the force that causes a 1-kilogram mass to accelerate at a rate of one meter per second each second (m/second squared)
Net Force
the overall force acting on an object after all the forces are combined
Friction
force that opposes the motion of objects that touch as they move past each other
Static Friction
the friction force that acts on objects that aren't moving
Sliding Friction
a force that opposes the direction of motion of an object as it slides over a surface
Rolling Friction
the friction force that acts on rolling objects
Fluid Friction
opposes the motion of an object through a fluid
Gravity
a force that acts between any two masses
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 (projectile) after it is given an initial forward velocity
Inertia
the tendency of an object to resist a change in motion
Mass
a measure of the inertia of the object and depends on the amount of matter the object contains
Weight
the force of gravity acting on an object
Momentum
the product of an object's mass and it's velocity (momentum=mass x velocity)
Law of Conservation of Momentum
if no net force acts on a system, then the total momentum of the system doesn't change
Electromagnetic Force
is associated with charged particles
Strong Nuclear Force
a powerful force of attraction that acts only on neutrons and protons in a nucleus, holding them together
Weak Nuclear Force
an attractive force that only acts over a short range
Gravitational Force
an attractive force that acts between any two masses
Centripetal Force
a center directed force that continuously changes the direction of an object to make it move in a circle