Measurement of Time and Motion
Short Questions
1. What is the SI unit of time?
Answer: Second (s).
2.What is a sundial used for?
Answer: Measuring time using the Sun’s shadow.
3.What is the time period of a pendulum?
Answer: Time taken to complete one oscillation.
4.What is speed?
Answer: Distance covered in unit time.
5.What is the SI unit of speed?
Answer: Metre per second (m/s).
6. What is uniform linear motion?
Answer: Motion with constant speed in a straight line.
7. What is a water clock?
Answer: A device that measures time using water flow.
8.Who invented the pendulum clock?
Answer: Christiaan Huygens.
9. What does an odometer measure?
Answer: Distance travelled by a vehicle.
10. What is non-uniform linear motion?
Answer: Motion with changing speed in a straight line.
Long Questions
1. How did ancient people measure time without clocks?
Answer: They used sundials, water clocks, hourglasses, and candle clocks. These devices tracked time using shadows, water flow, sand, or burning candles.
2. How does a simple pendulum work to measure time?
Answer: A pendulum swings back and forth in a fixed time period. This regular motion helps measure time accurately.
3. What is the difference between uniform and non-uniform motion?
Answer: Uniform motion has constant speed in a straight line. Non-uniform motion has changing speed or direction.
4. How can you calculate the speed of a moving object?
Answer: Divide the total distance covered by the time taken. Speed is measured in units like m/s or km/h.
5. Why is measuring tiny fractions of time important today?
Answer: It helps in sports to find winners, in medicine to monitor heartbeats, and in technology for fast devices. Accurate time measurement improves many fields like science and space exploration.
Leave a Reply