Science · Class 6
Motion and Measurement
Uniform and non-uniform motion; standard units of length and measurement.
3 sections15–25 min read6 MCQs · 2 examples
Chapter Overview
1 metre = 100 centimetres. Always measure from zero mark of scale, keeping eye perpendicular to reading.
Motion is change in position with time. This chapter introduces standard units of length (SI: metre), correct way to measure with scale, and types of motion — rectilinear, circular, periodic.
Standard Units
- SI unit of length: metre (m)
- 1 km = 1000 m; 1 m = 100 cm; 1 cm = 10 mm
- Correct measurement: correct scale, eye position, zero error checked
Types of Motion
- Rectilinear: straight line (train on track)
- Circular: along a circle (ceiling fan blades)
- Periodic: repeats after fixed interval (pendulum, Earth rotation)
- Oscillatory: to-and-fro (swing)
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Unit conversion
Convert 5.5 km to metres.
- 11 km = 1000 m
- 25.5 × 1000 = 5500
Answer
5500 m
Type of motion
What type of motion does a pendulum show?
- 1Moves to and fro about mean position
- 2Repeats after fixed time interval
- 3Periodic and oscillatory
Answer
Periodic oscillatory motion
Key Points to Remember
- ✓ Motion is relative to a reference point
- ✓ Metre scale should not be worn at ends
- ✓ Parallax error avoided by eye perpendicular to mark
Exam Tips
- • Show unit conversion steps clearly
- • Give two examples of each motion type
- • Draw diagram of correct eye position for reading scale
Practice MCQs — Motion and Measurement
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 6Score: 0/0
SI unit of length is: