मराठी

Explain the Following : After Alighting from a Moving Bus , One Has to Run for Some Distance in the Direction of Bus in Order to Avoid Falling .

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प्रश्न

Explain the following :
After alighting from a moving bus , one has to run for some distance in the direction of bus in order to avoid falling .

थोडक्यात उत्तर
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उत्तर

When people alight from a moving bus, they continue to run alongside the bus to avoid falling. If they were to stop at once, the feet would come to rest suddenly but the upper part of the body would still be in motion and they would tend to fall forward.

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पाठ 3: Laws of Motion - Exercise 3 (B) [पृष्ठ ६३]

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सेलिना Concise Physics [English] Class 9 ICSE
पाठ 3 Laws of Motion
Exercise 3 (B) | Q 21.4 | पृष्ठ ६३

संबंधित प्रश्‍न

A particle is found to be at rest when seen from a frame S1 and moving with constant velocity when seen from another frame S2. Mark out the possible options.
(a) Both the frames are inertial.
(b) Both the frames are non-inertial.
(c) S1 is inertial and S2 is non-inertial.
(d) S1 is non-inertial and S2 is inertial


A block of 2 kg is suspended from a ceiling by a massless spring of spring constant k = 100 N/m. What is the elongation of the spring? If another 1 kg is added to the block, what would be the further elongation?


State Newton's first law of motion.


Give qualitative definition of force on the basic of Newton's first law of motion.


Derive the relation between newton and dyne.


Give two examples of the following:
Inertia of rest


A smooth sphere of radius R and mass M is placed on the smooth horizontal floor. Another smooth particle of mass m is placed on the sphere and a horizontal force F is applied on the sphere as shown. If the particle does not slip on the sphere then the value of force F is ______.


The masses of 10 kg and 20 kg, respectively, are connected by massless spring as shown in the figure. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has acceleration of 12 m/s2. What is the acceleration of 20 kg mass?

(g = 10 m/s2)

 


A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).


Match the following.

Column I Column II
a. Newton’s I law propulsion of a rocket
b. Newton’s II law Stable equilibrium of the body
c. Newton’s III law Law of force
d. Law of conservation of Linear momentum Flying nature of bird

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