Question

one end of a light inextensible string is attached to a tool box of mass 2.5 kg which is lying on a horizontal table.
the string passing over a smooth pulley and is tied at other and to bag of mass 1.4kg
a) draw a diagram showing the forces acting on the toolbox
b) is the toolbox is just on the point of sliding find the value for omega the coefficient of friction

Answer 1

Answer: coefficient of friction  μ  = 0.56

Explanation:

When the tool box is at the point of sliding, the system is in static equilibrium due to Weight bag and maximum frictional force.

Consider bag as a system :

Tension T = wt of bag = 1.4 x 10 = 14 N

Consider Tool box as system :

For vertical equilibrium :

Normal reaction R = wt of tool box = 2.5 x 10 = 25 N

For horizontal equilibrium :

Max static frictional force = T

                                   f = T

                                 μR = 14

                                  μ = 14/25

                                      = 0.56

∴ coefficient of friction  μ (or ω) = 0.56

Answer 2

Answer:

yes

Explanation: