Question

Apparatus .of this to study the balanced and unbalanced forces by using the material available in day to day life requirement​

Answer 1

Answer:

Raise a small bag of sand or block of wood steadily and quite slowly, using the length of string that goes up and over the pulley. Let students pull it in the same way, and feel for themselves whether the force is the same however far the cord is pulled.

Pull the cord with the forcemeter. Show that the force is constant.

Allow the force to vary. This produces unbalanced force, so that the load speeds up (it accelerates) or slows down (it decelerates, or has negative acceleration).

Teaching Notes

You applied a constant force to the moving load through the string. This can balance its weight and the forces of friction that act at the pulley. When the forces are balanced there is no acceleration (though it does have velocity).

You could hold the load in a fixed position, and compare the force with that required for steady motion. You should find that the force is smaller. This is only because no effort is now needed to overcome frictional forces. The force, as before, is constant. Again the combined forces acting on the load are balanced. The load has no acceleration (or velocity). The common feature of the balanced forces is the absence of any change in velocity (acceleration).

This experiment was safety-tested in October 2004