Advertisements
Advertisements
Question
It is easier to cut with a sharp knife than with a blunt one. Explain.
Advertisements
Solution 1
It is easier to cut with a sharp knife than with a blunt one because, for the same applied force, the pressure exerted (force/area) is more in the case of the sharp knife than in the case of a blunt one.
Solution 2
We know that Pressure is inversely proportional to area.
So, a smaller area will exert more pressure, thus a sharp knife has a small area that comes in contact with the object, so more pressure can be applied on the object. Whereas a blunt knife has more area than a sharp knife and the pressure exerted by the blunt knife will be less as compared to that of a sharp knife.
Therefore it becomes easy to cut objects with a sharp knife than a blunt knife.
APPEARS IN
RELATED QUESTIONS
Explain why The blood pressure in humans is greater at the feet than at the brain
Explain why Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km
Two vessels have the same base area but different shapes. The first vessel takes twice the volume of water that the second vessel requires to fill up to a particular common height. Is the force exerted by the water on the base of the vessel the same in the two cases? If so, why do the vessels filled with water to that same height give different readings on a weighing scale?
How is the thrust related to pressure?
Find the thrust required to exert a pressure of 50000 pascals on an area of 0.05 m2 ?
Calculate the pressure in pascal exerted by a force of 300 N acting normally on an area of 30 cm2.
Consider the situation of the previous problem. Let the water push the left wall by a force F1 and the right wall by a force F2.
A water tank has four taps fixed at points A, B, C, D as shown in the following figure. The water will flow out at the same pressure from taps at
If the same force is made to act on a larger area, the pressure ______.
Pressure can be increased by decreasing the force.
