Question

2. Pressure
Take two iron nails, one with pointed end and the other with blunt end. Try to nail them into wall. What
did you observe? Answer the following questions:
1. When did you have to apply more force: while using pointed nail or blunt nail?
2. What could be the reason for the above observation?
3. Factors Affecting Frictions
Take an inclined plane, take two halves of the chart paper. Spread some pebbles on one of them and sand
on the other (a thin layer). Gently release the ball on the inclined plane. Observe the ball rolling down
over the spread of pebbles and note the distance moved by the ball. Repeat the experiment with the sand
spread on chart paper and then an a plain paper. Enter your observation in the table.

Answer 1

The higher pressure will be produce secondly area of contact will be smaller area of contact than blunt nails. and friction is affected by three factors.

The tip with the smallest area will produce a higher pressure when a small force is applied.

The force per unit area is referred to as the pressure. i.e. P=F/A Therefore, the pressure is a function of the contact area A and the force F. Sharp-tipped nails have a much smaller area of contact than blunt (non-sharp) nails, hence they exert more pressure with relatively tiny forces.

The adhesion between body surfaces, surface roughness, and deformation of the bodies are the three basic determinants of the frictional force between two bodies.

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