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The statement "friction force is a contact force while magnetic force is a non-contact force" is
1. always true.
2. true only at 0°C.
3. a false statement.
4. either true or false depending upon the temperature of the surroundings.

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Correct Answer - Option 1 : always true.

CONCEPT:

  • Force: Force is an external effect in the form of a push or pulls that:
  1. Produces or tries to produce motion in a body at rest.
  2. Stops or tries to stop a moving body.
  3. Changes or tries to change the direction of motion of the body.

There are two types of forces based on their applications:

  • Contact forces are those types of forces that result when the two interacting objects are in contact with each other physically. 
    • Example: Friction force, tension force, Normal force, etc.
  • Non-Contact Force - It is a force that acts on an object without coming physically in contact with it.
    • eg: Gravitational Force, Electrostatic force, Magnetic force

EXPLANATION:

  • The magnetic force is the force exerted by the charged body when it moves in a magnetic field. It is called non-contact force because it attracts the objects which do not require that objects in physical contact with each other. 
  • The frictional force is a contact force between two surfaces that are trying to move relative to each other (static friction) or is moving relative to each other (kinetic friction). Therefore option 1 is correct.

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