HOW FORCE AFFECT MOTION

PRERNA FOR IAS

HOW FORCE AFFECT MOTION

1. Introduction

Motion describes the change in position of an object over time. In earlier studies, concepts such as distance, displacement, velocity, and acceleration were introduced. This chapter explains the role of force in motion, balanced and unbalanced forces, friction, Newton’s laws of motion, and their applications in everyday life.

2. What Causes Motion?

Objects start moving, stop moving, speed up, slow down, or change direction because of force. A force acts on an object and alters its state of motion. Without an external force, an object tends to maintain its current state. Thus, force is the fundamental cause of changes in motion.

3. Concept of Force

Force is defined as a push or pull acting on an object. It arises from interaction between objects and can change an object's motion or shape. Common examples include kicking a football, pulling a cart, pushing a box, squeezing a lemon, and opening a door. Force is measured in newtons.

4. Examples of Force

Everyday activities demonstrate the action of force. Kicking a football applies force to move it. Pulling a cart changes its position. Pushing a box makes it slide. Squeezing a lemon changes its shape, while opening a door involves applying force to overcome resistance and produce movement.

5. Effects of Force

A force can produce several effects on an object. It can move a stationary object, stop a moving object, increase or decrease speed, change direction, or alter shape. These effects are observed in daily life, such as braking a bicycle, pushing a swing, or molding clay.

6. Moving a Stationary Object

A stationary object remains at rest until a force acts upon it. When sufficient force is applied, the object begins to move. For example, kicking a football causes it to roll across the ground. This demonstrates how force can overcome inertia and initiate motion in objects.

7. Stopping a Moving Object