English
Karnataka Board PUCPUC Science Class 11

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

Question

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?

Short/Brief Note
Advertisements

Solution

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
  Is there an error in this question or solution?
Chapter 5: Newton's Laws of Motion - short answers [Page 77]

APPEARS IN

HC Verma Concepts of Physics Vol. 1 [English] Class 11 and 12
Chapter 5 Newton's Laws of Motion
short answers | Q 14 | Page 77

RELATED QUESTIONS

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because ______.


Fill in the following blank with suitable word :

Newton’s first law of motion is also called Galileo’s law of ………………………


Define one newton force.


Name the physical quantity whose unit is ‘newton’.


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.


The figure shows a light spring balance connected to two blocks of mass 20 kg each. The graduations in the balance measure the tension in the spring. (a) What is the reading of the balance? (b) Will the reading change if the balance is heavy, say 2.0 kg? (c) What will happen if the spring is light but the blocks have unequal masses?


The acceleration of a particle is zero, as measured from an inertial frame of reference. Can we conclude that no force acts on the particle? 


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


The force exerted by the floor of an elevator on the foot of a person is more than the weight of the person if the elevator is
(a) going up and slowing down
(b) going up and speeding up
(c) going down and slowing down
(d) going down and speeding up


A block of mass 2 kg placed on a long frictionless horizontal table is pulled horizontally by a constant force F. It is found to move 10 m in the first seconds. Find the magnitude of F.


'When a hanging carpet is beaten with a stick, the dust particles start coming out of it'. This phenomenon can be best explained by making use of :


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


Derive the relation between newton and dyne.


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


The greater is the __________ the greater is the inertia of an object.


What do you mean by 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 ______.


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.


If the net force on an object is zero, what happens?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×