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.
Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Assertion (A) is false, but Reason (R) is true.
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2.
The reasons for excessive generation of wastes are:
(i) Use and throw policy.
(ii) Increased availability of packaged food.
(iii) Increased construction wastes.
(iv) Non-sorting of dry and wet wastes
- (i), (iii) and (iv)
- (i), (ii) and (iii)
- (i), (ii), (iii) and (iv)
- (ii), (iii) and (iv)
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3.
(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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4.
State two differences between the act of chewing food and salivation on sight of food.
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5.
Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?
Gamete carrying X chromosome from female parent.
Gamete carrying X chromosome from male parent.
Gamete carrying Y chromosome from male parent.
- (ii) and (iii)
- (i) only
- (i) and (iii)
- (iii) only
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6.
What is the function of diaphragm in human respiratory system ? Where is it present in human body ?
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