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Term 1 Unit 2 | 7th Science - Force and Motion | 7th Science : Term 1 Unit 2 : Force and Motion

Chapter: 7th Science : Term 1 Unit 2 : Force and Motion

Force and Motion

After studying this unit, students will be able *. To define distance and displacement. * To differentiate distance and displacement * To define speed, velocity and acceleration. To differentiate speed and velocity * To draw and explain distance- time and velocity time graphs.

Unit2

Force and Motion




 

Learning Objectives

After studying this unit, students will be able

*. To define distance and displacement.

* To differentiate distance and displacement

* To define speed, velocity and acceleration. To differentiate speed and velocity

* To draw and explain distance- time and velocity time graphs.

* To measure and calculate the speed of the moving objects.

* To know the day to day uses of centre of gravity and stability.

 

Introduction


As shown in the above picture, Kavitha can reach her school in two ways. Can you tell, by choosing which path she could reach the school early.

Road A

Road B

Road A (1.5 km)

Road B (2 km)

Road A is the answer

Look at the nearby picture


In which path the leaf will reach the ground first? Path A


Uma and Priya are friends studying in the same school. After school hours, they go to the nearby playground, play games and return back home. Oneday Uma told that she would reach the playground after visiting her grandmother’s house . The path in which they took reached the playground is shown here.


Take a twine and measure the length of the two paths (A & B). Which is the longest path among the two? Path B

From the above examples, we could conclude that when an object travel from one place to another, it will reach faster if it travels along the straight line path. The straight line path is the shortest distance between two points.

 

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