Page 64 - Physics

Physics for Secondary Schools

Chapter Three

Introduction to force

Introduction

The word force is often used in everyday situations. The interaction between
two or more objects involves forces acting between them. Objects that are
fl ying, hanging, balancing, moving, and spinning are all subjected to some
kind of force. Almost every activity you do in daily life requires the application
of force. This means, there are several types of forces with different effects.
Generally, it is hard to imagine a world without forces. In this chapter, you will
be introduced to different types of forces and their effects. The competencies
developed will enable you to classify forces as well as effectively apply forces
in your daily life.

Think
our life without the existence of force

Concept of force
If an object is at rest, it will remain in the state of rest unless some actions are performed
to make it move. Similarly, if an object is in motion, it will require some actions to
make it stop, otherwise it will keep moving. For example, r for a cart at rest to move,
it needs to be pushed or pulled. Similarly, a stationary car should be pulled or pushed
to make it move. The action of pushing or pulling objects to accomplish an intended
task involves force. Figure 3.1 shows pulling a cart and pushing a stationary car.

(a) Pulling a cart (b) Pushing a stationary car
Figure 3.1: Pulling and pushing actions

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Student’s Book Form One

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