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6 Terms
1
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Gravitational force
The gravitational pull of the earth on an object on or near the surface of the earth is called WEIGHT
2
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Spring force
A spring works in such a way that it always applies force in the OPPOSITE direction to its displacement from equilibrium.
3
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Tension
When a string (rope, wire) pulls on an
object it exerts a contact force that we call
tension force.
4
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Normal force
The force exerted on an object that is
pressing against a surface is the normal force.
Always perpendicular to the surface
5
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Friction
Friction is exerted by a surface. The frictional force is always PARALLEL to the surface
6
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Drag
The force of a fluid (life air or water) moving objects is called drag
Note 
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