Force and Pressure

UNIT 2

FORCE AND PRESSURE

Learning Objectives

After the completion of this lesson, students will be able to:

1. understand the concept of force and its effects.

2. differentiate thrust and pressure.

3. understand the characteristics of atmospheric and liquid pressure.

4. apply pascal’s law in day to day life.

5. understand the applications of surface tension and viscosity.

6. analyse friction in rest and motion.

7. know about the ways of increasing and decreasing friction.

8. solve numerical problems related to force and pressure.

Introduction

We see many objects in our daily life. Some of them are moving and some of them are at rest. A ball at rest, moves when it is kicked. Similarly when we push or pull objects which are at rest, they begin to move. This push or pull is called force. A force acting in a particular area, produces pressure. For example when we fasten a nail on the wall, pressure is exerted. Not only solids, gases and liquids also exert pressure. Pressure exerted by liquids and gases finds application in different fields.

Hydraulic lift and hydraulic break are working due to liquid pressure. In this lesson you will study about force and pressure. You will also study about surface tension viscosity and friction.