Module 3 Forces and Newton's Laws
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23 Terms
Force
A push or pull
Net Force
The sum of all of the forces acting on an object
Friction
The force that opposes the sliding motion of two surfaces that are touching each other
Gravity
An attractive force between any two objects that depends on the masses of the objects and the distance between them
Field
a region of space that has a physical quantity (such as a force) at every point
Weight
The gravitational force on an object
Newton's First Law of Motion
an object moves at a constant velocity unless an unbalanced force acts on it
Inertia
The tendency of an object to resist a change in motion
Newton's Second Law of Motion
An object's acceleration is in the same direction as the net force on the object and is equal to the net force exerted on it divided by its mass
Newton's Third Law of Motion
When one object exerts a force on a second object, the second object exerts a force on the first that is equal in strength and in the opposite direction
Air Resistance
A friction-like force that opposes the motion of objects that move through the air
Terminal Velocity
The maximum speed an object will reach when falling through a substance
Free Fall
When gravity is the only force acting on an object
Centripetal Force
A force exerted toward the center of a curved path
Law of Conservation of Momentum
If no external forces act on a group of objects, their total momentum does not change
Unbalanced Force
Forces that do not produce a net force of 0, causes movement
Balanced Force
Forced that produce a net force of 0, no movement
Sliding Friction
The force that works against the motion of two surfaces that are sliding across each other
Rolling Friction
Frictional force between a rolling object and the surface it rolls on
Gravitational Force Equation
gravitational force = constant x [(mass 1 x mass 2) / distance squared]
Weight Equation
Weight = mass x gravitational strength
Acceleration Equation
acceleration = change in velocity / time
Net Force Equation
force = mass x acceleration