Question

We are familiar with the effects of a force on different objects. Effect of force varies due to many reasons. Pressure always acts normal to the surface. There are many situations where we need to vary the amount of pressure. There are various types of pressure like hydrostatic pressure, atmospheric pressure etc. Thus pressure plays an important role in our life.
(a)Why heavy vehicles have wide tyres?
(b) How atmospheric pressure helps in drinking liquid with a straw?
(c) In a water tank, taps at lower height has more speed. Why?
(d) what is the S.I. unit of pressure?​

Answer 1

Explanation: a-Heavy trucks have broad tyres because broad tyres have large area of contact and less pressure on the ground.

b-A drinking straw is used by creating suction with the mouth. This causes a decrease in air pressure inside the straw. Since pressure acting on the surface of the drink is equal to atmospheric pressure, so this greater pressure pushes the soft drink up the straw into the mouth.

c-The height of the tank will determine the amount of pressure that the supply of water will have. Water is much denser than air, so the water is affected even more by small height differences

d-The SI unit for pressure is the pascal (Pa)