Pressure

What is pressure? While making a dam, where should be a thicker wall required, at the top or at the bottom? Why is it necessary to make the dam like this?

Calculate the change in pressure in the following cases.

1. When the force acting on the area is doubled, while the area is doubled.

2. When the force acting on the area is halved, while the area is halved.

Calculate the change in pressure in the following cases.

1. When the force acting on the area is doubled, while the area is halved.

2. When the force acting on the area is halved, while the area is doubled.

Initially a pressure $P_1$ were exerted on an object. Then, the force acting on area is increased by six times, while the area is reduced by three times. Calculate the new pressure $P_2$ in terms of $P_1$.

Initially a pressure $P_1$ were exerted on an object. Then, the force acting on area is tripled, while the area is doubled. Calculate the new pressure $P_2$ in terms of $P_1$.

Select the real life examples of pressure from the following.

The region of a knife's blade's edge is minimal. This is a real life example of pressure.

Give some real life examples of pressure.

Air pressure needed for a bicycle, cars and other vehicles is not example of atmospheric pressure.

A motorcycle weighs $1200 \mathrm{N}$. If the pressure exerted by one of its tyres is $120 \mathrm{Pa}$, then find the area of the tyre in contact with the road.

As air bubble rises from bottom to the top of a water tank, the size of the bubble _____. (increases/decreases)

When the piston is pushed in keeping the open end of the syringe closed, the air inside gets

Which one of the following statements is correct?

If a single nail pricks our body it is very painful. How is it possible for people to lie down on a bed of nails, still remain unhurt?

How do water exerts pressure on the walls of the container?

What is lateral pressure?

In this activity shown earlier, what is making the card stay in place?

What made the paper fly away?

State true or false.

The air pressure is greatest at the sea level.

Which of the following does not use AIR PRESSURE to work?