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?
He exerts equal forces on walls
He exerts only horizontal forces on the walls
The forces of friction at the walls are equal
The forces exerted by the walls on him are not horizontal
A force of $98\, N$ is required to just start moving a body of mass $100\, kg$ over ice. The coefficient of static friction is
Someone is using a scissors to cut a wire of circular cross section and negligible weight. The wire slides in the direction away from the hinge until the angle between the scissors blades becomes $2 \alpha$. The friction coefficient between the blades and the wire, is :-
For the given figure, if block remains in equilibrium position then find frictional force between block and wall ........ $N$
A box of mass $m\, kg$ is placed on the rear side of an open truck accelerating at $4\, m/s^2$. The coefficient of friction between the box and the surface below it is $0.4$. The net acceleration of the box with respect to the truck is zero. The value of $m$ is :- $[g = 10\,m/s^2]$
Why coefficient friction is considered as static friction ?