Question

1. What is meant by the statement rest and motion are relative terms? Give example to
show it
2. Explain whether the walls of a classroom are at rest or in motion
3. Define scalar and vector quantities.
4. Identify the following as a scalar or vector quantities:- mass, velocity, speed, length.
distance, displacement, temperature, force, weight, power, work and energy.
5. The school of a boy from his home is 1 km to the east. when he reaches back home, he says that he had travelled 2 kilometre distance but his displacement is zero justify your answer.
6. Under what condition, the average speed is equal to the magnitude of the average velocity?
7. Can the average speed of a moving body be zero?
8. Can the average velocity of a moving body be zero? state examples.
9. A car moves a distance of 5 km in 20 minutes. find the velocity of car in (a) Km/min (b) m/s (c) m/min (d) km/hr
10. When do you say that an object has positive acceleration and negative acceleration?
11. Name the two physical quantities which can be obtained from velocity-time graph.
12. Can an object be accelerated if it is moving with constant speed? If yes, explain giving examples.​

Answer 1

scalar - it specified the magnitude of objects
vector- it specified the magnitude as well as direction of an object