STANDARDPhysics-Laws of Motion
STANDARD Physics Friction MCQ Question
Type: MCQ-conceptual-Medium-Class 11
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 s⁻². The frictional force acting on the block is
A
10 N
B
5 N
C
2.5 N
D
20 N
Correct Answer
Option B
Detailed Explanation
Limiting friction, f = μmg = 0.6 × 1 × 9.8 = 5.88 N. Applied force, F = ma = 1 × 5 = 5 N. As F < f, the force of friction is 5 N.
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