Measurement of Time and Motion Class 7 Notes

Measurement of Time and Motion Class 7 Notes

Measurement of Time and Motion Class 7 Notes

1. Time: The process of quantifying the duration of events.
2. Motion: The change in position of an object over time.
3. Average speed: Total distance travelled divided by total time taken.
4. Sprint: To run or go very fast for a short distance.
5. Braille watch: A portable timepiece used by blind or visually impaired people.
6. Imposing: Ask someone to do something that may give them extra work or trouble.
7. Dripping: Extremely wet.
8. Monasteries: A building or buildings occupied by a community of monks living under religious vows.
9. Oscillation: Movement back and forth in a regular rhythm.
10. Investigate: To observe by close examination and systematic inquiry.
11. Electrocardiogram (ECG): Machine which measures the milli second variations in heartbeats to detect health issues.
12. Precise: Exact, accurate.
13. Odometer: The instrument which measures the distance travelled by the vehicle in kilometre.
14. Uniform linear motion: An object covers equal distances in equal intervals of time.

1. Measurement of Time

SI Unit: Second (s).

Types of Clocks:

1. Pendulum Clocks: Based on oscillatory motion.
2. Quartz Clocks: Use vibrations of quartz crystals.
3. Atomic Clocks: Measure time using specific atomic vibrations.

2. Measurement of Motion

Types of Motion:

1. Linear Motion: Motion along a straight line.
2. Uniform Linear Motion: Constant speed, equal distances in equal intervals of time.
3. Non-uniform Linear Motion: Changing speed, unequal distances in equal intervals of time.

Examples of Linear Motion:

1. Trains, cars, and other vehicles.

3. Simple Pendulum

Components:

1. Bob: The weight (metallic ball or stone).
2. String: The long thread suspending the bob.
3. Rigid Support: The fixed point from which the pendulum hangs.

Motion:

1. Oscillatory motion: Repeats after a fixed interval.
2. Time Period: The time taken for one complete oscillation.

4. Average Speed

Calculation formula:

Average Speed =[latex]\frac{\text { Total Distance }}{\text { Total Time }}[/latex]

Example: A car covering different distances in different time intervals.

5. Uniform and Non-uniform Motion

1. Uniform Motion: Object moves at a constant speed.
2. Non-uniform Motion: Object's speed changes over time.

Real-life Examples:

1. Uniform: A train moving at a constant speed.
2. Non-uniform: A car accelerating or decelerating.

6. Practical Applications

1. Measuring time using various methods (e.g., water clock, pulse rate).
2. Entertainment (e.g., swings in a playground).
3. Investigating factors affecting the time period of a pendulum.