A man balances himself in a horizontal position by pushing his hands and feet against two parallel w

English

Gujarati

Hindi

4-2.Friction

medium

A man balances himself in a horizontal position by pushing his hands and feet against two parallel walls. His centre of mass lies midway between the walls. The coefficients of friction at the walls are equal. Which of the following is not correct?

A

He exerts equal forces on walls

B

He exerts only horizontal forces on the walls

C

The forces of friction at the walls are equal

D

The forces exerted by the walls on him are not horizontal

Solution

The forces acting on the man at the walls are

$(a)$ horizontal normal reactions of the walls, and

$(b)$ Forces of friction acting upwards. The man exerts equal and opposite forces on the walls.

Standard 11

Physics

Share

Similar Questions

In figure, two blocks $M$ and $m$ are tied together with an inextensible and light string. The mass $M$ is placed on a rough horizontal surface with coefficient of friction $\mu$ and the mass $m$ is hanging vertically against a smooth vertical wall. The pulley is frictionless. Choose the correct statement $(s)$

hard

A heavy uniform chain lies on a horizontal table-top. If the coefficient of friction between the chain and table surface is $0.25$, then the maximum fraction of length of the chain, that can hang over one edge of the table is …… $\%$

medium

(AIPMT-1991)

Figure shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with $1\; m s^{-2}$. What is the net force on the man? If the coefficient of static friction between the man’s shoes and the belt is $0.2$, up to what acceleration of the belt can the man continue to be stationary relative to the belt? (Mass of the man $= 65 \;kg.)$

medium

Among the forces in nature, friction can be classified into

medium

The limiting friction is

easy