Objective: How does the static friction differ from the kinetic friction? Static

Question

Objective: How does the static friction differ from the kinetic friction? Static friction is a force that acts on an object that prevents it from sliding, while as kinetic friction is a force that applies when the object begins to slide. How do the static friction and kinetic friction depend on the normal force acting on the object? How do static and the kinetic friction depend on the area of contact between the object and the surface? What are the coefficients of the static friction and kinetic friction for the system studied? How does an object's mass affect its acceleration when it is sliding across a surface?

Explanation / Answer

1. Static friction is directy proportional the normal reaction(N)

Static friction force=sN

kinetic friction is also directy proportional the normal reaction(N)

kinetic friction force=kN

2.

static and kinetic friction does not depend upon the area of contact.

3.static friction coefficient is coefficients of frictional force when body does not move.

kinetic friction coefficient is coefficients of frictional force when body move.

4. acceleration a=F/m

so acceleration is deceases with increase in mass.

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