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## Ignore words

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Rolling Friction
Friction that occurs when an object rolls over a surface
sliding friction
friction caused by moving two flat surfaces against each other
fluid friction
a type of friction that occurs when a solid object moves through a gas or liquid
Issac Newton
British scientist who defined the laws of motion and discovered gravity
centrifugal force
a fictitious force that tends to throw an object off when the object is rotating in a non-inertial frame of reference
tension
a force exerted by any segment of a rope or string on an adjoining segment is _______.
compression
A force that pushes on or squeezes a material.
normal force
a perpendicular contact force exerted by a surface on another object is a(n) _______.
F=ma
Force Formula
Newton's second law
Acceleration is produced when a force acts on a mass, the greater the mass, the more force is required to accelerate the object.
Newton's first law
An object at rest remain and an object in motion remains in motion UNLESS it experiences an unbalanced force. Also called the Law of Inertia.
bending force
a combination of push (compression) and pull (tension) forces that results in a temporary curving change in the shape of some structures
sliding force
When one object is sliding across another
Torsion
Act of twisting
air resistance
Fluid friction acting on an object moving through the air.
gravity
(physics) the force of attraction between all masses in the universe
acceleration
(physics) a rate of change of velocity
balanced force
Equal forces acting on an object in opposite directions
unbalanced force
force acting on an object that causes a change
inertia
_______ is the property of an object that leads it to resist any change in motion
Action-reaction pairs
Two forces that have equal strengths but opposite directions are called _______.
Electromagnetic force
Binds atoms into nucleus
Newton's laws
Laws proposed by Isaac Newton that explain how force and motion work.
Centripetal Force
A force directed towards the center of a circle that causes an object to follow a circular path
Elastic force
The force exerted by a material when it is stretched or compressed