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CBSE Notes
Class 7
Science
Chapter 9 Motion And Time

CBSE Notes Class 7 Science Chapter 9 Motion And Time

Motion is a key concept in science that explains how objects change their position over time. We encounter various types of motion in our daily lives, whether it’s a car driving along the road or a child playing on a swing. By studying motion, we can gain insights into how and why objects move, as well as the various factors that influence their movement.

1.0Download CBSE Notes for Class 7 Science Chapter 9: Motion and Time - Free PDF!!

Hey there! Looking to ace your Class 7 Science Chapter on Motion and Time?

Grab these free CBSE notes for Class 7 in PDF format to make learning a breeze and boost your understanding of this fascinating topic!

Class 7 Science Chapter 9 Revision Notes:

2.0Motion

  • Motion refers to the change in an object's position over time. When an object's position remains constant with respect to time, it is considered to be at rest, stationary, or immobile. Conversely, any object that is changing its position is said to be in motion.
  • Motion is determined by the frame of reference. For example, when a person standing outside a bus is used as a reference point, the bus is seen as moving. However, if a person sitting inside the bus is the reference, the bus appears to be at rest.
  1. Oscillatory Motion:
  • Oscillatory motion refers to the movement of a body back and forth between two extreme positions. The midpoint between these extremes is known as the mean position. The time taken to complete one full oscillation is called the time period. When an oscillatory motion repeats at regular intervals, it is classified as periodic motion. While not all periodic motions are oscillatory, all oscillatory motions are inherently periodic. 
  • Examples of oscillatory motion include pendulums, swings, and objects attached to springs. In contrast, examples of periodic motion encompass the swinging of a pendulum, the rotation of the Earth on its axis, and the Earth's orbit around the Sun.
  1. Uniform And Non-Uniform Motion: For uniform motion if it covers equal distances in equal time intervals, while an object in non-uniform motion travels varying distances in the same time intervals.

3.0Speed

Speed is the rate at which an object's position changes over time. The average speed of an object during a specific time interval is calculated by dividing the distance traveled by the duration of that interval.

Speed= TotalTimeTakenTotalDistanceCovered​

  • The unit of distance is measured in meters or kilometres, while time is measured in seconds or hours. Consequently, common units of speed are expressed as meters per second (m/s) or kilometres per hour (km/h). It's important to note that units are always written in singular form; for instance, it should be km/h, not kms/hrs.
  • Fast and Slow Motion/Speed-Speed can be classified as fast or slow based on the distance covered within a specific time interval. For example, a slower-moving object will cover less distance compared to a motorbike, which travels at a faster speed.

4.0Graphs

A graph is a visual representation that illustrates the relationship between two or more variable quantities. A simple graph typically displays the connection between two measurements or values in a grid format. Graphs and charts can take various forms depending on the number of quantities involved and the method of representation used.

5.0Distance-Time Graph

This is typically represented as a line graph, as it involves two variable quantities: distance and time. In a distance-time graph, distance is plotted on the Y-axis (vertical), while time is represented on the X-axis (horizontal).

When selecting the most suitable scale for drawing a graph, consider the following points:  

  1.  Identify the maximum quantity for each axis.
  2.  Divide this maximum quantity into smaller, equal segments to facilitate easy point marking. The number of segments should be based on the available data
  3.  Aim to create a graph that utilises as much of the paper space as possible, ensuring it appears clear and organised.

Image showing distance time graph

6.0Measurement Devices In Vehicles And Other Instruments

  • Speedometer: Measures and displays the vehicle's instantaneous speed.
  • Odometer: Measures and shows the distance traveled by the vehicle.
  • Tachometer: Measures and displays the revolutions per minute (RPM) or the rotational speed of a shaft or disc.

7.0Benefits of CBSE Notes for Class 7 Science Chapter 9 - Motion and Time

  • Improved Understanding: By summarising and simplifying the content, notes can help you grasp the fundamental principles of motion and time more effectively.
  • Better Recall: Studying from well-structured notes can improve your ability to recall information during assessments.
  • Conceptual Clarity: Notes often emphasise the relationships between different concepts within the chapter, fostering a deeper understanding.
  • Potential Inclusion of Diagrams and Examples: Some CBSE notes may include relevant diagrams and examples to illustrate concepts, making them easier to visualise and comprehend.
  • Self-Assessment Support: After studying the notes, you can use them to quickly review and assess your understanding of the key topics.
  • Foundation for Higher Classes: A solid understanding of motion and time in Class 7 forms a crucial foundation for more advanced physics concepts in higher grades.

Chapter-wise CBSE Notes for Class 7 Science:

Class 7 Science Chapter 1 - Nutrition In Plants Notes

Class 7 Science Chapter 2 - Nutrition In Animals Notes

Class 7 Science Chapter 3 - Heat Notes

Class 7 Science Chapter 4 - Acids Bases And Salts Notes

Class 7 Science Chapter 5 - Physical And Chemical Changes Notes

Class 7 Science Chapter 6 - Respiration In Organisms Notes

Class 7 Science Chapter 7 - Transportation In Animals And Plants Notes

Class 7 Science Chapter 8 - Reproduction In Plants Notes

Class 7 Science Chapter 9 - Motion And Time Notes

Class 7 Science Chapter 10 - Electric Current And Its Effects Notes

Class 7 Science Chapter 11 - Light Notes

Class 7 Science Chapter 12 - Forests Our Lifeline Notes

Class 7 Science Chapter 13 - Wastewater Story Notes


Chapter-wise NCERT Solutions Class 7 Science:-

Chapter 1 - Nutrition in Plants

Chapter 2 - Nutrition in Animals

Chapter 3 - Heat

Chapter 4 - Acids, Bases and Salts

Chapter 5 - Physical and Chemical Changes

Chapter 6 - Respiration in Organisms

Chapter 7 - Transportation in Animals and Plants

Chapter 8 - Reproduction in Plants

Chapter 9 - Motion and Time

Chapter 10 - Electric Current and its Effects

Chapter 11 - Light

Chapter 12 - Forests: Our Lifeline

Chapter 13 - Wastewater Story

Frequently Asked Questions

An object in uniform motion covers equal distances in equal time intervals, while an object in non-uniform motion travels varying distances in the same time intervals.

Oscillatory motion is the back-and-forth movement of a body between two extreme positions, with the midpoint called the mean position. The time required for one complete oscillation is known as the time period. When this motion occurs at regular intervals, it is termed periodic motion. While not all periodic motions are oscillatory, all oscillatory motions are periodic. Examples include pendulums, swings, and springs, while periodic motion examples include the pendulum swing, Earth's rotation on its axis, and its orbit around the Sun.

It measures and displays the vehicle's instantaneous speed.

Motion is the change in an object's position over time. If an object's position is constant, it is considered at rest or stationary. In contrast, an object that changes its position is in motion. The perception of motion depends on the frame of reference. For instance, a person outside a bus sees it moving, while someone inside the bus perceives it as stationary.

Speed is the rate of change in an object's position over time. Average speed is measured by dividing the distance traveled by the time taken. Speed = (Total Distance Covered/Total Time Taken). Distance is measured in meter or kilometer, and time is measured in seconds or hours. General speed units are meters per second (m/s) or kilometers per hour (km/h). Remember, units should be in singular form; for example, use km/h, not kms/hrs.

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