Which one is easier to turn— a log or a bench of equal weight and length ? The two have the same coefficient of friction with the ground. Explain.

A spring is compressed between two toy carts to masses m_1 and m_2 . When the toy carts are released, the spring exerts on each toy cart equal and opposite forces for the same small time t. If the coefficients of friction mu between the ground and the toy carts are equal, then the magnitude of displacements of the toy carts are in the ratio

Which one of the following gives the dimensional formula of coefficient of friction?

A block of mass m slides from the top of an inclined plane of angle of inclination theta & length l . The coefficient of friction between the plane and the block is mu . Then it is observed over a distance d along the horizontal surface having the same coefficient of friction mu , before it comes to a stop. Find the value of d.

A 50 kg man is standing at the centre of a 30 kg platform A. Length of the platform is 10 m and coefficient of friction between the platform and the horizontal ground is 0.2. Man is holding one end of a light rope which is connected to a 50 kg box B. The coefficient of friction between the box and the ground is 0.5. The man pulls the rope so as to slowly move the box and ensuring that he himself does not move relative to the ground. If the shoes of the man does not slip on the platform, calculate how much time it will take for the man to fall off the platform. Assume that rope remains horizontal, and coefficient of friction between shoes and the platform is 0.6.

A board is balanced on a rough horizontal semicircular log. Equilibrium is obtained with the help of addition of a weight to one of the ends of the board when the board makes an angle theta with the horizontal. Coefficient of friction between the log and the board is

Two objects losing the same weight when immersed in water must have the same

Two blocks of mass 2m and m slide down the slope AB having same friction coefficient Then: