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Doctors Medicines MCQs Q&A

  1. electrostatic force, force of friction, magnetic force
  2. muscular force, force of friction, gravitational force
  3. drag, muscular force, force of friction
  4. gravitational force, electrostatic force, drag
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1 Answers

Option 3 : drag, muscular force, force of friction

Concept:

Force

  • Force is any push or pull that changes or tends to change
  • the state of rest or motion of the body
  • speed of a body
  • the direction of motion of the body
  • the shape of the body
  • Force always acts if two or more body interacts. 
  • Force is a vector quantity, which means both its magnitude (strength of force) and the direction of its application should be considered. 
  • For example, if two forces are acting in the same direction, their magnitude will be added up. 
  • Based on their application, force is of 2 types: Contact force and non-contact force.

Contact forces:

  • They are defined as the forces that result when the two interacting objects are in contact with each other physically.
  • Examples: frictional force, muscular force, drag force, etc.

Non-Contact forces:

  • They are forces that are experienced by bodies even without being physically in contact with it.
  • Examples: gravitational force, magnetic force, electrostatic force, etc.

Explanation:

  • The electrostatic force is the force exerted by the charged body on another charged or uncharged body. It is a non-contact force because it attracts the bodies which does not require that bodies are in physical contact with each other.
  • The force of friction is the contact force because it acts between two surfaces that are trying to move relative to each other (static friction) or is moving relative to each other (kinetic force).
  • The magnetic force is the force exerted by the charged body when it moves in a magnetic field. It is a non-contact force because it attracts the objects which does not require that objects in physical contact with each other.
  • The gravitational force is a non-contact force because this force does not influence the masses physically but will be experienced by both the masses. 
  • The muscular force is a contact force because it acts between two surfaces and these forces result due to the action of muscles of body parts like arms or legs and there is contact between the surface.
  • The drag force is the force that is exerted on a solid body moving concerning a fluid due to the movement of the fluid. It is a contact force because it acts between two surfaces and these forces try to hinder the motion of the object moving concerning the particle of the medium.

Thus, from the above discussion, it is clear that the correct answer is a drag, muscular force, or the force of friction.

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