NCERT Solutions for class 9 Science Chapter 8: Motion

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The NCERT Solutions for Class 9 Science Chapter 8 Motion are provided in this article below. Some of the important concepts of Class 9 Science Chapter 8 Motion are:

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NCERT Solutions for Class 9 Science Chapter 8

Important Topics for Class 9 Science Chapter 8 Motion

Motion of an object is perceived when its position changes continuously with respect to some stationary object. Terms such as distance,displacment, speed, velocity and acceleration are all related to the concept of motion. In physics, Motion is classified into two broad categories such as Uniform and Non-uniform motion.

Vector and Scalar Quantities

Vector can be defined as a quantity that includes both magnitude and direction. A scalar quantity, in the meantime, does not have any relevant direction but includes magnitude.

Example of Vector Quantity: Force and displacement are examples of Vector Quantities.
Example of Scalar Quantity: Mass, temperature, and time are all examples of Scalar Quantities.

Displacement

Displacement refers to shortest distance between an the initial and final position of an object. Displacement is known to carry a direction and vector quantity.

Displacement can be expressed by Δx. Hence, the Formula of Displacement is:
Δx = x_f − x₀

Here,
x_f = Final position of the object
x₀ = Starting position of the object

Velocity

Velocity is expressed as an object’s speed in a specific direction. Velocity is a vector quantity. Its SI unit is respresented as Metre (m).

The formula of Velocity is: Velocity = Displacement/Time

Also Read:

Unit Related Links
Speed-Time Graphs	Speed, Distance and Time Formula	Average Speed Formula
Uniform Motion	Uniform Circular Motion	Constant Acceleration
Equations of Motion by Graphical Method	Differences between Acceleration and Velocity	Motion Important Questions
Motion in a Straight Line	Angular Speed

Also Check:

Important Science Study Guides
Named Reactions	Difference between in chemistry	Difference between in biology
Physics Constants	Difference between in physics	Periodic Table

CBSE X Related Questions

1.
When you look at an object very close to your eyes, the:
- Ciliary muscles of your eye contract and the eye lens becomes thick.
- Ciliary muscles of your eye get relaxed and the eye lens becomes thick.
- Ciliary muscles of your eye contract and the eye lens becomes thin.
- Ciliary muscles of your eye get relaxed and the eye lens becomes thin.
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2.
(a) Study the given electric circuit in which 2 A electric current is flowing between points X and Y.

(i) Using the battery, key, voltmeter and ammeter in this given electric circuit, redraw a circuit diagram in which 2 \(\Omega\) and 4 \(\Omega\) resistors are connected between X and Y in parallel combination.
(ii) Circuit drawn by you, in which resistors are connected in parallel combination, calculate the electric current flowing through 4 \(\Omega\) resistor.
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3.
State two differences between the act of chewing food and salivation on sight of food.
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4.
From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively:
(i) Growth of pollen tube towards ovule.
(ii) Movement of sunflower towards sunlight.
(iii) Movement of root towards Earth/Gravity.
(iv) Movement of leaves due to breeze.
- (i) and (iii) respectively
- (iii) and (i) respectively
- (i), (ii) and (iii), (iv) respectively
- (i), (iii) and (ii), (iv) respectively
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5.
Give one example each of electrolytic decomposition and decomposition by sunlight.
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6.
(i) \( \text{AgNO}_3 + \text{NaCl} \rightarrow \text{NaNO}_3 + \text{AgCl} \)
(ii) \( \text{K}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 + 2\text{KCl} \)
Which of the following options clearly describes both the reactions?
- (i) is double displacement, (ii) is displacement reaction.
- Both, (i) and (ii) are displacement reactions and precipitation reactions.
- Both, (i) and (ii) are double displacement reactions and precipitation reactions.
- (i) is displacement, (ii) is double displacement reaction.
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