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.