Class 7 Science Motion and Time Notes

Science
Download PDF

Download Class 7 Science Motion and Time Notes in PDF format. All Revision notes for Class 7 Science have been designed as per the latest syllabus and updated chapters given in your textbook for Science in Class 7. Our teachers have designed these concept notes for the benefit of Class 7 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 7 Science for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 7 Science given on studiestoday

Revision Notes for Class 7 Science Chapter 13 Motion and Time

Class 7 Science students should refer to the following concepts and notes for Chapter 13 Motion and Time in Class 7. These exam notes for Class 7 Science will be very useful for upcoming class tests and examinations and help you to score good marks

Chapter 13 Motion and Time Notes Class 7 Science

Motion and Time
 
3.1 Introduction
 
In our daily life, we see various objects in motion. The walking man, the running cars, the water flowing in lakes, flying aeroplanes etc. are all examples of objects in motion.
 
- A body is said to be in motion if it changes its position with respect to a reference point.
 
- Motion and rest are relative terms for e.g. If A and B are sitting in a moving car and a third person C is standing outside than A and B are at rest w.r.t. each other but in motion w.r.t. C. - Speed is defined as distance travelled per unit time i.e. speed = distance/time
 
–Uniform motion – A body is said to have uniform motion if it moves with constant speed in same direction.
 
- Non uniform motion – A body is said to have non uniform motion if either speed or direction of the moving body changes.
 
- Average speed = total distance travelled /total time taken (for non-uniform motion)
 
-S.I unit of speed is m/s.
 
- Speed = distance/time
 
- Distance = speed x time
 
- Time = distance / speed
 
MEASUREMENT OF TIME-
 
- All of the clocks make use of some periodic motion. One of the most well-known periodic motions is that of a simple pendulum.
 
- The to and fro motion of a simple pendulumis an example of oscillatory motion which is a periodic motion.
 
- The time taken by a pendulum to complete one oscillation is called its time period.
 
- The basic unit of time is second.
 
3.2 Rest and Motion
 
Rest: A body is said to be in rest if it does not change its position with respect to time with respect to another body. Example-A book lying on a table.
 
Motion: A body is said to be in motion if it changes its position with respect to time with respect to another body. Example-A train moving on rails, a man walking on road.
3.3 Physical quantities
 
Physical quantity : The quantity which can be measured is called physical quantity. In Physics, we study about physical quantity.
 
Types of physical quantity
 
i) Fundamental physical quantity
 
ii) Derived physical quantity
 
Fundamental physical quantity : The physical quantities which are independent of other physical quantities are called fundamental physical quantities. Example : Lenth, Mass, Time etc.
 
Derived physical quantity: The physical quantities which depend on fundamental physical quantities are called derived physical quantities. Example : Speed, Energy etc.
 
All physical quantities can be categorised into scalars and vectors.
 
Scalars: The quantities which have magnitude only are called scalars. Example : Distance, Speed, Energy etc.
 
Vectors: The quantities which have magnitude as well as directions both are called vectors.
 
Examples : Displacement, Velocity, Force etc. A vector is represented by putting an arrow over symbol of the phycal quantity like velocity is represented as v r , force is represented as F , etc r
 
3.4 Speed

We know that some vehicles move faster than others. The distance moved by objects in a given interval of time can help us to decide which one is faster or slower.
 
Speed can be defined as the distance covered by an object in a unit time. Thus
 
Speed = Total distance covered / Total time taken
 
The S.I. unit of speed is m/s and it is a scalar quantity.
 
3.5 Velocity
 
The velocity of an object is the ratio of total displacement to the total time taken. Thus Velocity = Total displacement /Total time taken
 
The S.I. unit of velocity is similar to that of speed as m/s but velocity is a vector quantity, because it also determines the direction of motion.
 
3.5 Acceleration

The acceleration of a moving object is defined as the rate of change in its velocity with time. Thus 
Class 7 Science Motion and Time Advanced Notes
 
The S.I. unit of acceleration is m/s2 and it is a vector quantity.
 
3.6 Types of motion :

(a) Uniform Motion : If an object is moving along a straighty line with constant speed/velocity, it is said to be in uniform motion.
 
for Uniform motion : Velocity = constan
Class 7 Science Motion and Time Advanced Notes
So, for uniform motion acceleration is 0.
 
Equation of motion for uniform motion :

Distance/Displacement = speed × time = velocity × time
 
Note: For uniform motion along a straight line, speed and velocity are same. Similary, distance and displacement are also same for the above mentioned case.
 
(b) Non-uniform motion : If the velocity of an object keeps on changing with time, the motion is said to be non-uniform. Since, the velocity of the object is not constant, therefore, it possesses acceleration. So, depending on the acceleration, motion can be further of two types:
 
(i) Uniformly accelerated motion : Where the acceleration of the body remains constant.
 
(ii) Non-uniformly accelerated miotion : Where the acceleration of the body keeps on changing with time.
 
Equations of motion for uniformly accelerated body :
Class 7 Science Motion and Time Advanced Notes
Class 7 Science Motion and Time Advanced Notes_1

3.8 Distance time graph

The distance-time graph is a line graph. Let us learn to make such a graph. Take a sheet of graph paper. Draw two lines perpendicular to each other on it, as shown in figure given below:

Class 7 Science Motion and Time Advanced Notes_2

Mark the horizontal line as XOX’. It is known as the x-axis. Similarly mark the vertical line YOY’. It is called the y-axis. The point of intersection of XOX’ and YOY’ is known as the origin O. You can make the graph by following steps given below:

Draw two perpendicular lines to represent the two axes and mark them as OX and OY as in given figure. Decide the quantity to be shown along the x-axis and that to be shown along the y-axis. In this case we show the time along the x-axis and the distance along the y-axis. Choose a scale to represent the distance and another to represent the time on the graph. For the motion of the car scales could be

Time : 1 min = 1 cm. Distance: 1 km = 1 cm. Mark values for the time and the distance on the respective axes according to the scale you have chosen. Now you have to mark the points on the graph paper to represent each set of values for distance and time. The corresponding figure shows the set of points on the graph corresponding to positions of the car at various times.

Class 7 Science Motion and Time Advanced Notes_3

Joint all the points on the graph. This is the distnace time graph for the motion of the car. If the distance-time graph is a straight line, it indicates that the object is moving with a constant speed. However, if the speed of the object keeps changing, the graph can be of any shape.

 

Please click the link below to download pdf file for Class 7 Science Motion and Time Advanced Notes

Chapter 01 Nutrition in Plants
Class 7 Science Nutrition in Plants Notes
Chapter 02 Nutrition in Animals
Class 7 Science Nutrition in Animals Notes
Chapter 03 Fibre to Fabric
Class 7 Science Fibre to Fabric Notes
Chapter 04 Heat
Class 7 Science Heat Notes
Chapter 05 Acids, Bases and Salts
CBSE Class 7 Science Acids Bases and Salts Notes
Chapter 06 Physical and Chemical Changes
CBSE Class 7 Science Physical And Chemical Changes Notes
Chapter 07 Weather, Climate and Adaptations of Animals to Climate
Class 7 Science Weather Climate Adaptations of Animals to Climate Notes
Chapter 08 Winds, Storms and Cyclones
Class 7 Science Winds Storms and Cyclones Notes
Chapter 09 Soil
Class 7 Science Soil Notes
Chapter 10 Respiration in Organisms
Class 7 Science Respiration in Plants and Animals Notes
Chapter 11 Transportation in Animals and Plants
Class 7 Science Transportation in Animals and Plants Notes
Chapter 12 Reproduction in Plants
Class 7 Science Reproduction in Plants Notes
Chapter 13 Motion and Time
Class 7 Science Motion and Time Notes
Chapter 14 Electric Current and its Effects
Class 7 Science Electric Current and its Circuits Notes
Chapter 15 Light
Class 7 Science Light Notes
Chapter 17 Forests: Our Lifeline
Class 7 Science Forests Our Lifeline Notes
Chapter 18 Wastewater Story
Class 7 Science Waste Water Story Notes
Tags
CBSE Concepts notes
CBSE Class 7 Science Concepts notes
CBSE Class 7 Science pdf Concepts notes
Class 7 Science Concepts notes pdf
CBSE Class 7 Science
Science Class 7 Concepts notes
CBSE Class 7 Science Chapter Concepts notes
Concepts notes for Class 7 Science

CBSE Class 7 Science Chapter 13 Motion and Time Notes

We hope you liked the above notes for topic Chapter 13 Motion and Time which has been designed as per the latest syllabus for Class 7 Science released by CBSE. Students of Class 7 should download and practice the above notes for Class 7 Science regularly. All revision notes have been designed for Science by referring to the most important topics which the students should learn to get better marks in examinations. Our team of expert teachers have referred to the NCERT book for Class 7 Science to design the Science Class 7 notes. After reading the notes which have been developed as per the latest books also refer to the NCERT solutions for Class 7 Science provided by our teachers. We have also provided a lot of MCQ questions for Class 7 Science in the notes so that you can learn the concepts and also solve questions relating to the topics. We have also provided a lot of Worksheets for Class 7 Science which you can use to further make yourself stronger in Science.

Where can I download latest CBSE Class 7 Science Chapter 13 Motion and Time notes

You can download notes for Class 7 Science Chapter 13 Motion and Time for latest academic session from StudiesToday.com

Are the revision notes available for Chapter 13 Motion and Time Class 7 Science for the latest CBSE academic session

Yes, the notes issued for Class 7 Science Chapter 13 Motion and Time have been made available here for latest CBSE session

Is there any charge for the Class 7 Science Chapter 13 Motion and Time notes

There is no charge for the notes for CBSE Class 7 Science Chapter 13 Motion and Time, you can download everything free of charge

Which is the best online platform to find notes for Chapter 13 Motion and Time Class 7 Science

www.studiestoday.com is the best website from which you can download latest notes for Chapter 13 Motion and Time Science Class 7

Where can I find topic-wise notes for Class 7 Science Chapter 13 Motion and Time

Come to StudiesToday.com to get best quality topic wise notes for Class 7 Science Chapter 13 Motion and Time