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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (मराठी सेमी-इंग्रजी) इयत्ता ९ वी

Give a scientific reason. When an object falls freely to the ground, its acceleration is uniform. - Science and Technology

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प्रश्न

Give a scientific reason.

When an object falls freely to the ground, its acceleration is uniform.

टीपा लिहा
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उत्तर

When an object falls freely to the ground, it is under the effect of a constant force known as the force of gravity. No other forces act on it. Hence, from Newton's second law of motion, we can say that this constant force of gravity accelerates the freely falling object uniformly. This uniform acceleration is known as acceleration due to gravity which acts towards the centre and is denoted by g.

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पाठ 1: Laws of Motion - Exercises [पृष्ठ १७]

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बालभारती Science and Technology [English] 9 Standard Maharashtra State Board
पाठ 1 Laws of Motion
Exercises | Q 5. a. | पृष्ठ १७

संबंधित प्रश्‍न

Give one example of the following motion:

Uniform retardation


Define the term acceleration due to gravity. State its average value.


State the type of motion represented by the following sketches in Figures.

Give an example of each type of motion.


Explain the following concept in your own words with everyday examples:

Acceleration


Give an example of an accelerated body, moving with a uniform speed.


Draw velocity – time graph for the following situation:

When a body is moving with variable velocity, but uniform retardation.


From the diagram given below, calculate acceleration.


From the velocity – time graph given below, calculate deceleration in region BC.


The acceleration of a moving body is constant in magnitude and direction. Must the path of the body be a straight line?
If not, given an example.


Write the SI unit of acceleration and retardation.


Distinguish between uniformly and non-uniformly accelerated motions.


The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?


What happens to the stepwise increasing speed-time graph when the size of each step is made very small?


Convert the following acceleration:
 1/36 m/s2 into km/h2


The rate of change of velocity is ______.


Exercise Problem.

A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?


The Unit of acceleration is ______.


The speed of a particle is constant. Will it have acceleration? Justify with an example.


A bus accelerating with 4ms-2 changes its speed from 60ms_1 to a certain value in 5s. The final speed is ______.


Acceleration is defined as the rate of change of ______.


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