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Science Class 7 - Heat Motion-And-Time Notes

Comprehensive study notes for Class 7 - Heat Motion-And-Time olympiad preparation

Heat, Motion and Time

Welcome to the chapter on Heat, Motion and Time for Class 7. In this chapter, you will learn about heat and its effects, how things move, and how we measure time. By the end of this chapter, you will understand the concepts of heat, motion, and time, and how they are important in our daily life and in science!

Introduction

Heat, motion, and time are important concepts in science. Heat makes things warm, motion is about movement, and time helps us measure changes and events. Let’s explore each topic in detail!

Heat

Heat is a form of energy. It can make things warmer and change their state. We get heat from the sun, fire, electricity, and even our bodies.

  • Heat can melt ice and boil water.
  • Heat can expand metals and make liquids evaporate.
  • Heat moves from a hotter object to a colder one.

Effects of Heat

  • Change of state (solid to liquid, liquid to gas)
  • Expansion and contraction of materials
  • Cooking food
  • Drying clothes

Motion

Motion means movement. When something changes its position, it is said to be in motion. Cars, people, animals, and planets all show motion.

  • Types of motion: straight line (linear), circular, and periodic (back and forth).
  • Speed is how fast something moves.
  • Distance is how far something moves.

Measuring Motion

  • We use rulers, measuring tapes, and odometers to measure distance.
  • We use stopwatches and clocks to measure time taken for motion.

Time

Time helps us know when events happen and how long they last. We measure time in seconds, minutes, hours, days, and years.

  • Clocks and watches help us measure time.
  • Calendars help us track days, months, and years.
  • Stopwatches measure short intervals of time.

Fun Activity: Heat and Motion Around You

Observe how ice melts in a warm room (heat). Watch a ball roll down a slope (motion). Use a clock to measure how long it takes!

Summary

  • Heat is energy that makes things warm and can change their state.
  • Motion is movement; it can be straight, circular, or periodic.
  • Time helps us measure changes and events.

Practice Questions

  1. What is heat? Name two sources of heat.
  2. Give one example of change of state due to heat.
  3. What is motion? Name two types of motion.
  4. How do we measure time?
  5. What is speed?

Challenge Yourself

  • Find three things at home that use heat.
  • Measure how long it takes you to walk from one room to another using a clock.

Did You Know?

  • The sun is the biggest source of heat for Earth!
  • The fastest animal on land is the cheetah, which can run up to 120 km/h.

Glossary

  • Heat: Energy that makes things warm.
  • Motion: Movement or change of position.
  • Time: What we measure with clocks and watches.
  • Speed: How fast something moves.
  • Distance: How far something moves.

Answers to Practice Questions

  1. Heat is energy that makes things warm. Sources: Sun, fire, electricity.
  2. Ice melting into water.
  3. Motion is movement. Types: Linear (straight), circular, periodic.
  4. With clocks, watches, and calendars.
  5. Speed is how fast something moves.

Explore heat, motion, and time in your daily life and see science in action!

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