On the horizontal surface of a truck a block of mass 1 kg is placed ( μ = 0.6) and truck is moving with acceleration 5 m/sec2 then the frictional force on the block will be (a) 5 N (b) 6 N (c) 5.88 N (d) 8 N

Answer: (a). To move with the truck the block needs f = ma = 1 × 5 = 5 N. Maximum static friction μ mg = 0.6 × 1 × 9.8 = 5.88 N > 5 N, so the block does not slip. Static friction only supplies what is needed: f = 5 N. So the answer is (a) 5 N.

On the horizontal surface of a truck a block of mass 1 kg is placed (… | NEET 2001 (AIPMT)

Q37NEET 2001 · AIPMTMedium

Friction Basics

On the horizontal surface of a truck a block of mass 1 kg is placed ( $\mu$ = 0.6) and truck is moving with acceleration 5 m/sec2 then the frictional force on the block will be

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Answer: (a)

To move with the truck the block needs $f = ma = 1 \times 5 = 5\text{ N}$ .
Maximum static friction $\mu mg = 0.6 \times 1 \times 9.8 = 5.88\text{ N} > 5\text{ N}$ , so the block does not slip.
Static friction only supplies what is needed: $f = 5\text{ N}$ .
So the answer is (a) 5 N.

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