Advertisements
Advertisements
Question
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Advertisements
Solution
It is difficult to cut cloth using a pair of scissors with blunt blades because blunt blades have more area and due to which applied force produces very less pressure. As we know that pressure is inversely proportional to area of cross-section, so it is difficult to cut cloth from blunt blades.
(As; P = `"F"/"A"`)
APPEARS IN
RELATED QUESTIONS
Explain why Hydrostatic pressure is a scalar quantity even though the pressure is force divided by area.
The unit of thrust is
Calculate the pressure exerted on a surface of 0.5 m2 by a thrust of 100 kgf.
Water flows through a horizontal tube of variable cross section. The area of cross section at A and B are 4 mm2 and 2 mm2 respectively. If 1 cc of water enters per second through A, find (a) the speed of water at A, (b) the speed of water at B and (c) the pressure difference PA − PB.
Consider the statement given below and choose the correct option.
Assertion: Sharp knives are used to cut the vegetables.
Reason: Sharp edges exert more pressure.
A brick is kept in three different ways on a table as shown in the following figure. The pressure exerted by the brick on the table will be
 |
 |
 |
| A | B | C |
Explain why the cutting instruments are sharpened.
Give reasons why:
a single nail pricking the body is painful when compared to lying on a bed of nails.
The net force in a particular direction is called ______.
Pressure is a scalar quantity because ______.
- it is the ratio of force to area and both force and area are vectors.
- it is the ratio of the magnitude of the force to area.
- it is the ratio of the component of the force normal to the area.
- it does not depend on the size of the area chosen.
