Motion and Time basic concepts and small problems
- 12. Time period= Total time taken ÷ Number of oscillations
- 13. Question 3. A simple pendulum takes 32s to complete 20 oscillations. What is the time period of the pendulum? Answer: The time taken to complete one oscillation is known as time period of the pendulum. Time Period = (Total time taken)/ (Number of Oscillations) Given: - 20 oscillations taking 32s to complete. Therefore 1 oscillation will take = (32)/ (20) sec = 1.6 second Therefore 1.6s is the time period of the pendulum.
- 14. 1. A fly flaps its wings 90 times in 30 seconds. What is the time period of flapping of wings?
- 15. Time period = total time taken/ number of oscillations T = 90/ 30 T = 0.33 seconds. So ,the time period is 0.33 seconds.
- 20. Uniform Motion A body is said to be in uniform motion if it travels in straight line and covers equal distances in equal interval of time.
- 21. Non Uniform Motion A body is said to be in uniform motion if the speed or direction of the body does not remains constants.
- 23. Q3. Determine the time taken when, distance is 7150 km and speed is 780 km/hr. Given Distance = 7150 km speed= 780 km/h Time = Distance /Speed Q4. If distance travelled by a train is 495 km in 4 hours 30 minutes, what is its speed? Given : Distance = 495 Km Time = 4 h 30 min. 30/60 = 0.5 h = 4.5 h Speed = Distance/ Time
- 24. Q6. The speed of the train is 72 km per hour. Find its speed in metre per second. 72000/3600 =20 m/s Q7. Express the speed of 60 m per minute in km per hour. 60/1000/1/60 = 60x60/1000 Q8. A man runs at the speed of 10 km/hr. How much time will he take to cover 750 metres?
- 25. Q9. Aaron ran 500 metre in 100 Seconds. Find the speed in km per hour. Q10. A cyclist travels at a speed of 20 km/hour. How far will he travels in 50 minutes?
- 29. Q1.Find speed when, distance is 142 km and time is 2 hours. Given : Distance = 142 Km Time = 2h Speed = distance/Time Q2. Find out the distance covered when, speed is 960 km/hour and time is 1 hour 50 minutes. Given: Speed = 960 Km/h = 960/60 = 16 km/min Time = 1h 50 min. = 110 min distance = 16x 110 =1760 km