Question

On the horizontal surface of a truck (μ = 0.6), a block of mass 1 kg is placed. If the truck is accelerating at the rate of 5m/sec² then frictional force on the block will be

• A. 5 N
• B. 6 N
• C. 5.88 N
• D. 8 N

Answer 1

Answer: (A)

5 N

Answer 2

$F_{l} = \mu mg = 0.6 \times 1 \times 9.8 = 5.88\mspace{6mu} N$

Pseudo force on the block

= $ma = 1 \times 5 = 5\mspace{6mu} N$

Pseudo is less then limiting friction hence static force of friction