Force
A push or pull that acts on an object
Newton (N)
SI unit to measure force. equal to the force that causes a 1-kilogram mass to accelerate at a rate of 1m/second^2 (1N=1kg*m/s)
Net Force
the overall force acting on an object after all the forces are combined
Friction
a force that opposes the motion of objects that touch as they move past each other
Static Friction
A force that opposes the direction of motion of an object as it slides over a surface.(hardest to overcome)
Sliding Friction
A force that opposes the direction of motion of an object as it slides over a surface. (2nd hardest to overcome)
Rolling Friction
The friction force that acts on rolling objects. (3rd hardest to overcome)
Fluid Friction
a friction force that opposes the motion of an object through a fluid.
Air Resistance
Fluid friction acting on an object moving through air
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.
Inertia
The tendency of an object to resist a change in it's motion
Mass
A measure of the inertia of an object, which 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 (mom=mv)
Law of Conservation of Mass
if no net force acts on a system, then the total momentum of the system doesn't change.
Gravitational Force
an attractive force that acts between any two masses
Newton's First Law Of Motion
An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity unless acted upon by an unbalanced force. (Law of Inertia)
Newton's Second Law of Motion
F=ma (unbalanced)
Newton's Third Law of Motion
For every action there is an equal and opposite reaction. (pairs, action-reaction)
Law of Conservation of Momentum
When a moving object hits another object, some or all of the momentum of the first object is transferred to the object that is hit. If only some of the momentum is transferred, the rest of th momentum stays with the first object.