Motion , Class 9th
Ncert intext question 1,2 , 3 and 5 question please give me only questions
Answers
Answer:
Is displacement a scalar quantity?
ANSWER:
No, displacement is a vector quantity because it has magnitude as well as direction.
Page No 19:
Question 2:
State whether distance is a scalar or a vector quantity.
ANSWER:
Distance is a scalar quantity; it has magnitude but no specific direction.
Page No 19:
Question 3:
Change the speed of 6 m/s into km/h.
ANSWER:
We have to convert 6 m/s into km/h. So,
6 m/s=(6)(3600)1000km/h=21.6 km/hr6 m/s=(6)(3600)1000km/h=21.6 km/hr
Page No 19:
Question 4:
What name is given to the speed in a specified direction?
ANSWER:
Velocity is the name given to the speed of a body in a particular direction.
Page No 19:
Question 5:
Give two examples of bodies having non-uniform motion.
ANSWER:
Two examples of non-uniform motion:
(a) Motion of a bus on a curved road
(b) Motion of a bee flying randomly in air.
Explanation:
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Answer:
1. A farmer moves along the boundary of a square field of side 10m in 40s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds?
2. Which of the following is true for displacement?
i. It can not be zero.
ii. It's magnitude is greater than the distance travelled by the object.
3. Distinguish between speed and velocity.
5. What does the odometer of an automobile measure?