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(14) A brick slides on a horizontal surface. The frictional force on it will increase when: (a) A second brick is placed on top of

(14) A brick slides on a horizontal surface. The frictional force on it will increase when: (a) A second brick is placed on top of it. (b) The area of contact between the brick and the surface is decreased. (c) The area of contact between the brick and the surface is increased. (d) The mass of the brick is decreased

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