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Physics Question on laws of motion

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/s2 then the frictional force on block will be : -

A

5N

B

6N

C

5.88N

D

8N

Answer

5N

Explanation

Solution

The correct option is (A): 5N.

On the horizontal surface of a truck a block of mass 1 kg is placed

frL = µs.N pseudo force = ma
= µs.mg = 1 × 5
= 0.6 ×1 × 10 F = 5 N
= 6N
∴ F < frL block does not move
static firction = applied force
⇒\Rightarrow fr = 5N