1. A person X travelling in a car with a speed of 60 km per hour. Another person Y who is 100m behind X , claims that the first person X is at rest. Is it possible? Justify your answer.
2. Differentiate between uniform motion and non uniform motion. Write three differences. Explain with the help of suitable example.
3. Distinguish between rotatory motion and translatory motion with the help of suitable examples. Write three points.
4. Distinguish between following:
A. Rectilinear motion and curvilinear motion.
B. Circular motion and rotatory motion.
C. Oscillatory motion and vibratory motion.
D. Periodic motion and non periodic motion.
5. Distinguish between mass and weight . Write five differences.
6. A person goes from his office to another City by car at a speed of 60 km per hour and returns back through the same route at a speed of 45 km per hour. Find the average speed of his journey?
7. A person x off mass 90 kg. If the pull of gravity on 1 kg on the surface of earth is 9.8 Newton and at the surface of moon is 1.6 Newton, find
A. The weight of person x on the earth.
B. The weight of the person at at the moon surface.
8. A boy Travels a distance of of 2 km in the first 2 hour, 0.5 kilometre in the third hour and 0.6 km in the fourth hour. Find the average speed of the boy in
A. Kmh-¹
B.ms-¹
9. Is it possible to measure weight of a person by using a beam balance .justify your answer. If weight cannot be measured by it, then how will you measure the weight of a person ?explain its principle.
10. State two units of speed and weight. Establish the relationship between their Si units.
First question answer
ReplyDeleteYes it is possible. It is possible if the second person Y is also travelling at a speed of 60Km/h.
This is because in 1 hour X will travel 60Km and Y will also travel 60Km but Y will be 100m behind X .So in relation to Y ,X will be at rest.
No it is not possible to measure the weight of a person using a small and ordinary beam balance.
ReplyDeleteTo measure the weight of a person we will measure the mass of the person using an electronic balance.
Then we will use the following relation as applicable-
Weight =mass × acceleration due to gravity
W= M × g
Where g= 9.8 m/s²