हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

Consider a Book Lying on a Table. the Weight of the Book and the Normal Force by the Table on the Book Are Equal in Magnitude and Opposite in Direction. is this an Example of Newton'S Third Law?

Advertisements
Advertisements

प्रश्न

Consider a book lying on a table. The weight of the book and the normal force by the table in the book are equal in magnitude and opposite in direction. Is this an example of Newton's third law?

टिप्पणी लिखिए
Advertisements

उत्तर

No, this is not an example of Newton's third law. According to Newton's law, if a body A exerts a force on body B, then B exerts a force on A equal in magnitude and opposite in direction. The forces act on different bodies. So, the normal by table on the book is action and the reaction pair is the force on a table by the book. Weight is due to the force of the earth on the book, not due to the table. Hence this is not an action-reaction pair
shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 5: Newton's Laws of Motion - short answers [पृष्ठ ७७]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
अध्याय 5 Newton's Laws of Motion
short answers | Q 14 | पृष्ठ ७७

संबंधित प्रश्न

What is the other name of Newton’s first law of motion ?


A moving bicycle comes to rest after sometime if we stop pedalling it. But Newton’s first law of motion says that a moving body should continue to move for ever, unless some external force acts on it. How do you explain the bicycle case ?


Name the law involved in the following situation :

if there were no friction and no air resistance, then a moving bicycle would go on moving for ever.


It is sometimes heard that the inertial frame of reference is only an ideal concept and no such inertial frame actually exists. Comment.


Neglect the effect of rotation of the earth. Suppose the earth suddenly stops attracting objects placed near its surface. A person standing on the surface of the earth will.


A force F1 acts on a particle accelerating it from rest to a velocity v. Force F1 is then replaced by F2 which decelerates the particle to rest.


A reference frame attached to the earth
(a) is an inertial frame by definition
(b) cannot be an inertial frame because the earth is revolving around the sun
(c) is an inertial frame because Newton's laws are applicable in this frame
(d) cannot be an inertial frame because the earth is rotating about its axis.


How does Newton's second law of motion differ from the first law of motion?


What do you mean by inertia of motion?


Give one example each of inertia of rest and inertia of motion.


What do you mean by inertia of rest?


Name the scientist who first stated the law of inertia.


Match the following

Column I Column II
Newton’s I law propulsion of a rocket
Newton’s II law Stable equilibrium of a body
Newton’s III law Law of force
Law of conservation of linear momentum Flying nature of bird

Classify the types of force based on their application.


A mass of 2 kg is suspended with thread AB (Figure). Thread CD of the same type is attached to the other end of 2 kg mass. Lower thread is pulled gradually, harder and harder in the downward directon so as to apply force on AB. Which of the threads will break and why?


In a legend, the hero-kid kicked a toy pig so that it is projected with a speed greater than that of its cry. If the weight of the toy pig is assumed to be 5 kg and the time of contact 0.01 sec., the force with which the hero-kid kicked him was ______.

(Speed of cry = 330 m/s)


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).


This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement 1: If you push on a cart being pulled by a horse so that it does not move, the cart pushes you back with an equal and opposite force.

Statement 2: The cart does not move because the force described in statement 1 cancel each other.


An insect is at the bottom of a hemispherical ditch of radius 1 m. It crawls up the ditch but starts slipping after it is at height h from the bottom. If the coefficient of friction between the ground and the insect is 0.75, then h is ______. (g = 10 ms−2)


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×