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## Class 9 Physics (India)

### Course: Class 9 Physics (India)>Unit 3

Lesson 4: Thrust & pressure

# Pressure & thrust

What are thrust and pressure? Well, that's exactly what we will explore in this video. We will also learn the formula and units of pressure, by taking various examples. Created by Mahesh Shenoy.

## Want to join the conversation?

• What is the direction of thrust? Is it downwards? My teacher said that it is downwards in solids and upwards in liquids and gases?
(1 vote)
• Thrust can be in any direction, just that it is perpendicular to the surface it is applied on.

I think your teacher's explanation isn't a proper and correct way to explain stuff. Solids at rest are only pulled by gravity, hence their thrust is downwards. However, fluids (i.e. liquids and gases) apart from being pulled by gravity, also exert thrust of the walls of their container due to their ability to flow. This thrust is exerted on all walls irrespective of the wall being upwards or downwards or sidewards. (in case of liquid, it is not exerted on the upward wall because liquid particles don't have enough kinetic energy to jump up against gravity. However, the liquid will exert upward thrust if something is immersed in it i.e. buoyant force)

Hope that helped. Feel free to comment if you need further help :)