Question

man walks on the ground in air medium along the EAST direction; he encounters both solid friction and fluid friction. These two forces act: 1 point (A) Along EAST (B) Along WEST (C) One along EAST and other along WEST (D) None of these

Answer 1

Given:

A man walks on the ground in air medium towards the EAST direction; he encounters both solid friction and fluid friction.

To find:

Direction of the resistive forces

Calculation:

The forces acting on the man are :

• Solid friction : due to interaction between his foot and ground.

• Fluid friction : Stroke's force due to movement within air medium.

Both solid and fluid friction acts at an angle of 180° to the direction of instantaneous velocity of a body.

This means that both solid and fluid friction act opposite to the direction of movement of body

180° to East means West direction

So, final answer:

$\boxed{ \sf{ \red{ \large{ Along \: \: WEST}}}}$