Question

If the tip of a needle or the edge of a knife becomes blunt, then the needle does not penetrate the cloth and the knife does not cut into the fruit. Why is this so?

Answer 1

You can understand this by the formula of Pressure

Pressure = Force / area

so blunt knife means more area...so less force

Hope you understand

Thanks

Answer 2

Dear Student,

◆ Answer with explaination -

• As we know, pressure acting at a point is given by formula, P = F/A.
• When tip of needle or edge of knife is blunted, area at the cutting surface is increased.
• As pressure is inversely proportional to area, pressure will be decreased.
• Here enough pressure will not be created so as to cut fruit or penetrate clothes.

Thanks dear...