Bissoy.com
Doctors Medicines MCQs Q&A

  1. Static friction is the only force acting on it
  2. Gravitational force is the only force acting on it.
  3. No force is acting on it.
  4. A pair of balanced forces is acting on it.
4 views

1 Answers

Option 4 : A pair of balanced forces is acting on it.

Concept:

Force:

  • A force is something that changes the state of rest or motion of a body.
  • The Force of friction always opposes the motion of objects.
  • The Force is a vector quantity.
  • Its SI unit is Kgms-1. It is also known as Newton.

First Law of the Motion:

  • It states that an object continues to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.
  • Newton's First Law is also known as Inertia.
  • The natural tendency of objects to resist a change in their state of rest or of uniform motion is called Inertia.

Second Law of the motion:

  • It states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.
  • Mathematically, F = m × a

Second Law of the motion:

  • It states that to every action, there are equal and opposite reactions and they act on two different bodies.
  • These forces are called action-reaction forces.

Explanation:

According to Newton's third law of motion,

To every action, there are equal and opposite reactions.

  • When two bodies A and B exert force on each other, the force by A and B is equal and opposite to the force by B and A.
  • Mathematically, we can say, FAB = - FBA

  • When the book is kept on the table, the book attracts the earth is an action force whereas the earth attracts the book is a reaction force.
  • The table is just forming the contact force because it is in between the earth and the book.
  • Here, the earth and the book are forming action-reaction pairs but not the table and book.
  • So, the action and reaction forces act on the book lying at rest on the table.

Thus from the above discussion, it is clear that a pair of balanced forces are acting on it.

4 views

Related Questions

In the question below are given four statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: All Bad are Cart. No Cart is Yard. No Yard is Seat. Some Seat are Table. Conclusions:                                                                                        I. Some Table will not be Yard.                                                 II. All Table are Yard.                             III. No Bad is Yard.                                                                                 IV. Some Bad are Seat. ?
1 Answers 5 Views