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1.a)knives and blades have sharp edges because they provide less surface area relating to more Pressure.
b)Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. ... The greater pressure at the bottom would give a greater 'force per unit area' on the wall.
2.Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
The frictional force between two bodies depends mainly on three factors: (I) the adhesion between body surfaces (ii) roughness of the surface (iii) deformation of bodies.
3.Metals
1.Metals are malleable and ductile.
2.Metals are good conductors of heat and electricity.
3.Metals are lustrous and can be polished.
Non-metals
1.Non- metals are brittle (break easily). They are neither malleable nor ductile.
2.Non-metals are bad conductors of heat and electricity. Except for graphite which is a good conduction of electricity.
3.Non-metals are non-lustrous (dull) and cannot be polished. Except for iodine.
4.Fluid friction depends on all three, the speed and shape of the object and the nature of the fluid.
There are several ways to reduce friction:
The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example.
Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.
5.Straw: When the liquid is sucked up by a mouth through the straw, the air pressure inside the straw and in straw decreases. And the air pressure on the surface of the liquid is equal to the atmospheric pressure.
6.Ink dropper consists of a tube with a hole at the end and a bulb at the other end. ... Due to the dipping of it in ink,some ink gets into the tube. When you release the bulb, a vacuum gets created at the region of the bulb. Due to the immense air pressure at the surface of ink,the ink gets pushed into the empty space also.
7.Reactive Metals like sodium, potassium, and lithium are highly flammable in nature. These reactive metals when comes in contact with air (presence of oxygen or moisture) catches fire and thus they are kept immersed in the kerosene oil to avoid injuries due to the accidental fire.
8.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.
9.Coal gas is produced when coal is heated in the absence of air in an enclosed chamber.
Coal gas is used in lighting. The gas is also used for heating. Most often than not many people use this gas for cooking. It is used as a fuel.
10.Pressure is the perpendicular force per unit area, or the stress at a point within a confined fluid.In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals.
The pressure depends on force applied and the area on which force is acting.