(a) The force of static friction is directly proportional to the mass of an object. As the mass of an object increases, the force of static friction required to overcome its inertia and start it moving also increases.
(b) The force of kinetic friction is also directly proportional to the mass of an object. As the mass of an object increases, the force of kinetic friction required to keep it moving at a constant velocity also increases.
(c) The coefficient of static friction does not depend on the mass of an object. It is a constant value that depends on the nature of the two surfaces in contact with each other.
(d) The coefficient of kinetic friction also does not depend on the mass of an object. It is a constant value that depends on the nature of the two surfaces in contact with each other.
How does the mass of an object pulled along a horizontal surface affect the following parameters?
(a) force of static friction
(b) force of kinetic friction
(c) coefficient of static friction
(d) coefficient of kinetic friction
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