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NCERT Solutions for Class 7 Science Chapter 13: Motion and Time

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The chapter starts with the discussions of the motion of the body. The difference between speed and velocity, the motion of a pendulum, and our everyday life experiences have been elaborated upon in this chapter. The following are the points discussed in the chapter:

  • The distance moved by an object in a unit time is called its speed. It is a scalar quantity.
  • The distance moved by an object in a unit time in a specific direction is called its velocity. It is a vector quantity.
  • The speed of an object is the distance travelled divided by the time taken to cover that distance. Its basic unit is metre per second (m/s).
  • Odometer is used to measure the distance moved by the vehicle.
  • Periodic events are used for the measurement of time. The periodic motion of a pendulum has been used to make clocks and watches.
  • The motion of objects can be presented in pictorial form by their distance-time graphs. The distance-time graph for the motion of an object moving with a constant speed in a straight line.

 

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Also See
Chapter 1 Nutrition in Plants Chapter 2 Nutrition in Animals Chapter 3 Fiber to Fabric
Chapter 4 Heat Chapter 5 Acids, Bases and Salts Chapter 6 Physical and Chemical Changes
Chapter 7 Weather, Climate and Adaptations of Animals to Climate Chapter 8 Winds, Storms and Cyclones Chapter 9 Soil
Chapter 10 Respiration in Organisms Chapter 11 Transportation in Animals and Plants Chapter 12 Reproduction in Plants
Chapter 14 Electric Current and its Effects Chapter 15 Light Chapter 16 Water: A Precious Resource
Chapter 17 Forests: Our Lifeline Chapter 18 Wastewater Story

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