Which is the law of friction?
A: Friction froce is independent over the area and shape of contacting surface
B: Friction froce is inversely proportional to the normal reaction
C: Friction froce acts in the same direction of motion
D: Friction froce is not a dependent on nature of contacting surface
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Friction froce is independent over the area and shape of contacting surface
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The first law of friction says that the amount of friction is proportional to the normal force exerted between the surfaces. What exactly is a normal force?
The first law of friction says that the amount of friction is proportional to the normal force exerted between the surfaces. What exactly is a normal force?The normal force (N) is a support force that is exerted on the object by the surface it's sitting on. It's the force that keeps you from falling through your chair when you sit down. The normal force can change based on the weight of the object and the angle of the surface it's on (if the surface isn't flat).
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