Pressure

A force of $120 \mathrm{N}$ is applied to an object of area $3 {\mathrm{m}}^2$. Calculate the pressure. 

A brick is $32 \mathrm{cm}$ long, $10 \mathrm{cm}$ wide and $10 \mathrm{cm}$ thick. It weighs $16 \mathrm{N}$ and is lying on the ground. Find the pressure exerted by the brick on the ground. 

A solid object weighs $250 \mathrm{N}$. When placed on a wooden plank, the area of contact is found to be $10 {\mathrm{m}}^2$. Find the pressure exerted by the solid object on the wooden plank.

Explain why

(a) a heavy truck is fitted with six to fourteen tyres,

(b) skiers use long flat skis to slide over snow,

(c) foundations of high-rise buildings are kept wide.

Nitika is cutting fruits for her grandmother as she is ill. She finds it difficult to cut fruits. She sharpens the cutting edge of the knife and cuts the fruits easily. How does sharpening the knife help in cutting the objects easily?

This activity shows the pressure of a liquid _____ with depth.

The pressure is greatest at the hole 

The water from the uppermost hole A travels _____ distance from the base of the vessel. 

When we go to high altitudes, then _____ (pressure / mass) decreases.

Liquids exert _____ pressure at the same depth.

If the area of contact is larger, the pressure is

Pressure is defined as

The SI unit of pressure is

What are the two parameters that define pressure?

Define pressure. What is the SI unit of pressure? 

Larger the area of contact _____ is the pressure on the object. 

The SI unit of pressure is  

What is the SI unit for measuring pressure?

Demonstrate an activity which shows pressure exerted by water at the bottom of the container depends on the height of its column of water.

Why are railway tracks laid on large sized wooden, iron or cement sleepers?