Question

A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6 If the acceleration of the truck is 5 m/s², the frictional force acting on the block is :

(1) 5 N 

(2) 6 N

(3) 10 N 

(4) 15 N

Answer 1

Correct Answer is: (1) 5 N

Solving from the frame of truck

f ≤ μmg = 6

⇒ f = 5N.