Question

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

Correct option (a) 5 N

Explanation:

where f_rL is the force of limiting friction.

Pseudo force : ma = 1 x 5 ; F = 5 N

If F<f_rL block does not move. So static friction is present.

Static friction = applied force .

:. f_r = 5 N