Question

Two objects A and B are moving on rough surface as shown in figure. Object A has greater velocity than B then *

1 point



A) A experiences more frictional force than S

B) B experiences more frictional force than A

C) Both experience same frictional force

D) Cannot be said because data is insufficient.

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Answer 1

Answer:

A) A experiances more frictional force than s

Answer 2

B experiences more frictional force than A. (Option B)

• Frictional force is always opposing the relative motion of the body.
• When a body is dragged along a rough surface, the frictional force will be acting in the direction opposite to the displacement.
• The angle between the frictional force and the displacement of the body will be 180o. Thus, the work done by the frictional force will be negative.

Frictional force is independent of velocity therefore,

Na = m(a) * g = 50 * 10 = 500N

Nb = m(b) * g = 100 * 10 = 1000N

Therefore, B experiences more frictional force than A.

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