8. Motion-Accelaration Science Class 9 In English-CBSE Notes
Explore science cbse notes for Class 9 Chapter 8. Motion Topic Accelaration in English medium for exams preparation.
8. Motion-Accelaration Science Class 9 In English-CBSE Notes
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All Topics Chapter 8. Motion
- 1. Distance and Displacement
- 2. Velocity
- 3. Accelaration
- 4. Graphical representation of motion
- 5. Uniform Circular motion
- 6. Numerical Problems
- 7. Assignment
Notes
8. Motion-Accelaration Science Class 9 In English-CBSE Notes
8. Motion
Accelaration
Acceleration :
Acceleration is changing in the velocity of an object per unit time is called acceleration.
In other words:
The rate of changing in the velocity is known as acceleration.
- The SI unit ofacceleration is m s-2.
- It is denoted by a.
- Acceleration is a vector quantity.
Accelerated motion: If the velocity of an object changes from an initial value u to the final value v in time t, the acceleration is a, and this kind of motion is known as accelerated motion.
Example: A bus starts from rest and attains a speed of 72 km h-1 in 5 minutes while moving in uniform motion. Find the acceleration of the bus.
Solution:
Time (t) = 5 minites = 5 × 60 = 300 seconds
Initial velocity u = 0 [∵ bus was in rest]
Final velocity v = 72 km h-1
= (20 - 0)/300
= 0.066 ms-2
Acceleration of object = 0.066 ms-2
Type of accelerations are based on direction of acceleration:
These are:
(I) Positive acceleration
(II) Negative acceleration
(I) Positive acceleration : If the velocity of an object increases with time in the direction of motion of the object, this is known as positive acceleration.
The direction of acceleration is same as the direction of motion.
Main points:
- The direction of acceleration is same as the direction of motion.
- When the velocity increases with time in the same direction.
- When an object starts from rest.
- The final velocity is greater than initial velocity i.e (v > u).
(II) Negative acceleration : If the velocity of an object decreases with time in an opposite direction of motion of the object, this is known as negative acceleration.
Retardation: Negative accelaration is known as retardation.
Main points:
- The direction of acceleration is opposite to the direction of motion.
- Negative accelaraion produces when the velocity decreases with time.
- When an object is going to rest.
- The final velocity is smaller than initial velocity i.e (v < u).
Uniform accelaration: When the velocity of an object changes by an equal amount in equal intervals of time such a accelaration of the object is known as uniform accelaration.
Uniformly accelarated motion: The motion of an object having uniform accelaration is known as uniformly accelarated motion.
Examples:
(i) motion of a rolling ball on smooth surface.
(ii) The motion of a freely falling body.
(iii) Motion of the earth round the sun.
(iv) A high speed lift starts from multi-storied building.
(v) The motion of the moon round the Earth.
Non-uniform accelaration: When the velocity of an object changes by an unequal amount in equal intervals of time such a accelaration of the object is known as non-uniform accelaration.
Non-uniformly accelarated motion: The motion of an object having different accelaration is known as non-uniformly accelarated motion.
Examples:
(i) A racing car.
(ii) The motion of vehicles moving at differents speeds.
(iii) The ball is thrown upward at top it get retarded.
(iv) The motion of a bus passing through rough road.
All Topics Chapter 8. Motion
8. Motion-Accelaration Science Class 9 In English-CBSE Notes
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CBSE Notes for Class 9 science Chapter 8. Motion – Accelaration
The CBSE Notes for Class 9 science Chapter 8. Motion – Accelaration are prepared to help students understand every concept in a simple, clear, and well-organized manner. These notes are based on the latest CBSE syllabus and are suitable for regular classroom learning, homework, revision, and examination preparation. Every topic is explained using easy language so that students can learn important concepts without difficulty and develop a strong academic foundation.
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Success in examinations depends on consistent practice and smart revision. These CBSE Notes for Class 9 science Chapter 8. Motion – Accelaration are designed to reduce study pressure by presenting important information in a concise and meaningful way. Students can use them throughout the academic session for daily learning as well as last-minute revision before examinations.
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8. Motion-Accelaration Science Class 9 In English-CBSE Notes Study Materials For Class 6 to 12
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