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Chapter 8: Measurement of Time and Motion Notes

Home / Class Notes / Class 7 / Science / Chapter 8: Measurement of Time and Motion
✓ Free notes Class 7 Science 1 study file

About these notes

Class 7 Science Measurement of Time and Motion notes give clear explanations, key definitions and formulas for revision and quick practice for CBSE and Bihar Board students; use Merit Spring ROH for chapter test practice and mock tests. Main sub-topics: measurement of time (SI unit second, stopwatches), types of motion (uniform and non-uniform), speed and average speed (speed = distance ÷ time), reading distance–time graphs, unit conversion and exam tips. Who it is for: Class 7 students preparing for school chapter tests, term exams and board-pattern mock tests; find important questions and MCQ on the site for extra practice.

Key points you will learn

  • Class 7 Science Measurement of Time and Motion notes
  • Speed = distance ÷ time (use same units, e.g., m and s)
  • Average speed = total distance ÷ total time
  • Uniform vs non-uniform motion; recognise by equal or unequal distances in equal time intervals
  • Distance–time graph: slope = speed; horizontal line means rest
  • SI unit of time is second (s); convert hours and minutes to seconds before calculation
  • Common error: mixing units (km with m, hours with seconds); always convert first

What is inside this chapter

📄

Measurement of Time and Motion - Chapter 8 Notes (Class 7 Science)

Class 7 Science Measurement of Time and Motion - Chapter 8 handwritten-style revision notes for CBSE and Bihar Board students.

📥 Open notes

Questions students ask

How to calculate speed from distance and time?

Speed is calculated by dividing distance by time: speed = distance ÷ time. Ensure distance and time use the same units (metres with seconds). For a multi-leg trip use average speed = total distance ÷ total time.

What is the difference between uniform and non-uniform motion?

Uniform motion means equal distances in equal time intervals; non-uniform does not. A straight line on a distance–time graph shows uniform motion, while a curved line shows changing speed.

Where can I practise chapter test, MCQ and important questions for this chapter?

Practise chapter test and mock tests on Merit Spring ROH; the site offers board-pattern practice, timed tests and MCQ sets. Use these alongside the notes for targeted revision and self-assessment.

How do I read a distance–time graph to find speed?

The slope of a distance–time graph gives speed: calculate change in distance ÷ change in time between two points. A straight sloped line means constant speed; a horizontal line means no motion.

What are common mistakes students make in this chapter?

Mixing units (km vs m, hours vs seconds), not converting time before calculation, misreading graph slopes, and forgetting units in answers. Always convert units and write the unit with your final answer.

← Previous chapter Chapter 7: Heat Transfer Nature

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