Force
A push or pull. Described by how strong they are and also direction. m x a=force
Unbalanced Force
two or more forces that are not equal and opposite of one another; can cause change in motion (start moving or change direction)
Balanced Force
equal forces acting on one object in opposite directions
Net Force
the overall force on an object when all the individual forces acting on it are added together
Inertia
the tendency of an object to resist any change in motion
Mass
the amount of matter in an object
Newtons first law of motion
An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocit, unless it is acted upon by an unbalanced force." Another name is Law of Inertia
Newtons second law of motion
The net force of an object is equal to it's mass times its acceleration. F=MxA
Newton
A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second
Friction
a force that opposes motion between two surfaces that are touching
Sliding Friction
friction that occurs when one solid surface slides over another
Rolling Friction
friction that occurs when an object rolls over a surface
Fluid Friction
friction that occurs as an object moves through a fluid
Gravity
force of attraction between all objects in the universe
Free fall
the motion of a falling object when the only force acting on it is gravity
Projectile
an object thrown into the air with great force
Air Resistance
the fluid friction experienced by objects falling through the air
Terminal Velocity
the greatest velocity a falling object reaches
Weight
the vertical force exerted by a mass as a result of gravity Mass times acceleration due to gravity = weight.
The Law of Universal Gravitation
all objects in the universe attract each other through gravitational force
Newton's Third Law of Motion
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
momentum
the product of an object's mass and velocity
Satellite
any celestial body orbiting around a planet or star
Centripetal Force
A force that causes an object to move in a circle