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# PBHS Force

### Force Unit

TermDefinition
newton SI unit of force
Inertia Resistance to any change in motion
Law of Inertia Newton's 1st Law of Motion is often called the
net force The total or sum of all forces acting on an object
balanced forces Condition when all of the forces add up to zero or "cancel each other out"
unbalanced forces Condition when the net force is not zero or the forces do not "cancel each other out"
acceleration Unbalanced forces result in this
mass The amount of inertia something has depends on its amount of
Newton's 1st Law of Motion This law is often called the law of inertia
Newton's 2nd Law of Motion This law describes the relationship of force and mass to acceleration
F = ma The formula for Newton's 2nd Law of Motion is this
friction Motion is always opposed by
terminal velocity When weight is balanced by air resistance an object falls at this constant velocity
simultaneous The action-reaction force pairs occur at this time
forces In Newton's 3rd Law of Motion, the ____ are equal in size, but opposite in direction.
Law of Conservation of Momentum The total momentum is the same before and after a collision. This states this law.
Newton's 2nd Law of Motion F = ma is the formula for this law
momentum p = mv is the formula for
air resistance Terminal velocity is reached when weight has been balanced by
weight An object's mass times gravity gives the object's
force Because weight is due to gravity, weight in physics is a
9.8 m/s/s On Earth, objects accelerate due to gravity at this rate
velocity Momentum depends upon an object's mass and
Newton's 3rd Law of Motion For every action there is an equal and opposite reaction
Newton's 1st Law of Motion An object at rest will stay at rest and an object in motion will stay in motion in the same direction at the same speed unless acted upon by an unbalanced force
Created by: gkarlish