Question

Figure shows a man of mass 55 kg standing stationary with respect to a horizontal conveyor belt that is accelerating with $1 \mathrm {~ms} ^ { - 2 }$ . The net force acting on the man is :

• A. 35 N
• B. 45 N
• C. 55 N
• D. 65N

Answer 1

Answer: (C)

55 N

Answer 2

Here mass of the man $M = 55 \mathrm {~kg}$

As the man is standing stationary w.rt the belt,

Acceleration of man = acceleration of belt

$\therefore$Acceleration of man $a = 1 m s ^ { - 2 }$

$\therefore$Net force on the man

$F = M a = ( 55 \mathrm {~kg} ) \left( 1 \mathrm {~ms} ^ { - 2 } \right) = 55 \mathrm {~N}$