NCERT Solutions for Class 9 Science Chapter 8

NCERT Solutions for Class 9 Science Chapter 8 Motion answers of all pages like Intext Questions on Page 100, Page 102, Page 103, Page 107, Page 109 and Exercises in English Medium free to download for new academic session 2020-21. These Solutions are useful for Uttar Pradesh High School Students also. So, download UP Board Solutions for 9 Science chapter 8 here in Hindi Medium. The videos related to each chapters are also available to free download. Hindi Medium version of 9th Science chapter 8 पेज 110 के उत्तर, पेज 112 के उत्तर, पेज 114 के उत्तर, पेज 118 के उत्तर, पेज 121 के उत्तर and अभ्यास के प्रश्न उत्तर are given to study online or download in PDF format.

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NCERT Solutions for Class 9 Science Chapter 8

Class:9
Subject:Science – विज्ञान
Chapter 8:Motion

9th Science Chapter 8 Answers in English & Hindi Medium

CBSE NCERT Solutions for Class 9 Science Chapter 8 Motion all Intext Questions with exercises questions answers free to download or use online. All the solutions are in updated form for current academic session 2020-21. Download Class 9 Science App in Hindi and English Medium for offline use.




Class 9 Science Chapter 8 Solutions Related Pages

Define speed and velocity. What are their SI units?

Speed: Speed of a body is defined as the distance travelled by the body in unit time.
Velocity: Velocity of a body is the distance travelled by the body in unit time in a given direction.
The SI unit is meter/second.

Usha swims in 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of usha.

3 m/s ; zero

Ahmed is moving in his car with a velocity of 45 km/h. How much distance will he cover (a) in one minute and (b) in one second?

(a) 750 m ;
(b) 12.5 m.

A train starting from rest attains a velocity of 72 km h^-1 in 5 minutes. Assuming that the acceleration is uniform, find (i) the acceleration and (ii) the distance travelled by the train for attaining this velocity.

(i) 1/15 m/s² ;
(ii) 3 km

A body starts to slide over a horizontal surface with an initial velocity of 0.5 m/s. Due to friction, its velocity decreases at the rate of 0.05 m/s². How much time will it takes for the body to stop?

10 seconds

What type of motion of tips of second’s hand of a watch? Is it uniform or accelerated?

The motion of the tip of second’s hand of a watch is not a uniform motion. It is accelerated motion due to change in the direction of motion.

What is the nature of the distance-time graph for uniform and non-uniform motion of an object?

When the motion is uniform, the distance-time graph is a straight line with some slope.
When the motion is non-uniform, the distance time graph is not a straight line. It can be any curve.

What is locomotion?

Locomotion is the ability of an animal to move its whole body from place to place without any external forces.




Questions for Practice on 9th Science Chapter 8

Question 1:
A train travels 100 m long moving on a straight level track passes a pole in 5 s. Find (a) the speed of the train (b) the time it will take to cross a bridge 500m long.
Answer 1:
(a) 20 m/s
(b) 30 s

Question 2:
A car accelerates uniformly from 18 km/h to 36 km h/ in 5 second. Calculate (i) the acceleration and (ii) the distance covered by the car in that time.
Answer 2:
1 m/s² ; 37∙5 m



Important Questions on 9th Science Chapter 8

एक वस्तु के द्वारा कुछ दूरी तय की गयी। क्या इसका विस्थापन शून्य हो सकता हैं? अगर हाँ, तो अपने उत्तर को उदाहरण के द्वारा समझाएँ।
हाँ, विस्थापन शून्य हो सकता है, यदि वस्तु अपने प्रारंभिक स्थान पर वापस पहुँच जाए।
जैसे: वृत्ताकार मार्ग पर एक चक्कर लगाने के बाद वस्तु का विस्थापन।
An athlete completes one round of circular track of diameter 200 m in 40 sec. What will be the distance covered and the displacement at the end of 2 minutes 20 sec?
Time taken = 2 min 20 sec = 140 sec.
Radius, r = 100 m.
In 40 sec the athlete complete one round.
So, in 140 sec the athlete will complete = 140 ÷ 40 = 3.5 round.
⇒ Distance covered in 140 sec = 2πr × 3.5 = 2 × 22/7 × 100 × 3.5 = 2200 m.
At the end of his motion, the athlete will be in the diametrically opposite position.
⇒ Displacement = diameter = 200 m.
विस्थापन के लिए निम्न में कौन सही है? (a) यह शून्य नहीं हो सकता है। (b) इसका परिमाण वस्तु के द्वारा तय की गई दूरी से अधिक है।
(a) और (b) दोनों में से कोई भी सत्य नहीं है। क्योंकि यह शून्य हो सकता है तथा इसका परिमाण वस्तु के द्वारा तय की गई दूरी से कम या बराबर होता है।
When will you say a body is in (i) uniform acceleration? (ii) non-uniform acceleration?
(i) A body is said in uniform acceleration when its motion is along a straight line and its velocity changes by equal magnitude in equal interval of time.
(ii) A body is said in non-uniform acceleration when its motion is along a straight line and its velocity changes by unequal magnitude in equal interval of time.
किस अवस्था में किसी वस्तु के औसत वेग का परिमाण उसकी औसत चाल के बराबर होगा?
औसत चाल और औसत वेग तभी बराबर हो सकता है जब वस्तु का विस्थापन, तय की गई दूरी के बराबर हो। जैसे: यदि कोई वस्तु एक सरल रेखा में तथा एक निश्चित दिशा में गति करती है, तो उसकी औसत चाल तथा औसत वेग बराबर होते हैं।
एक गाड़ी का ओडोमीटर क्या मापता है?
एक गाड़ी का ओडोमीटर गाड़ी द्वारा तय की गई दूरी मापता है।
जब वस्तु एकसमान गति में होती है तब इसका मार्ग कैसा दिखाई पढ़ता है?
एकसमान गति से चलने वाली वस्तु का मार्ग एक सरल रेखा जैसा दिखाई पढ़ता है।

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