2) 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 passes
over a smooth pulley and is tied at the other end to a bag of mass
1.4 kg.

a) Draw a diagram showing the forces acting on the tool box.
1.4 kg

b) If the tool box is just on the point of sliding, find a value for u,
the coefficient of friction.

3) The coefficient of friction between a load of sand and the tray of a truck in which it carries is
0.8. At what angle to the horizontal does the truck tray have to be tilted before the sand starts
to slide out?

4) Blocks of masses m and M are connected by a light string.
The coefficient of friction between m and the table surface is
miu.

Determine the acceleration of the masses and tension in the
string if m = 4 kg. M = 5 kg and miu= 0.30.​