Madhya Pradesh Police Exam Model Paper 9

Option 3 is correct, i.e. Frictional force .

● The force of friction always acts in a direction opposite to that in which the body tends to move, which means against the direction of the force.

• The amount of friction is exactly equal to the force that appears to move the body, before the limiting value is reached.
• The restricting friction magnitude bears a constant ratio between the two surfaces to the natural reaction.
• Friction force is dependent on surface roughness / smoothness
• The frictional force is independent of the contact area between the two surfaces .

Extra facts:

Electrostatic force:

• The electrostatic force, also known as the Coulomb Force, is an attractive and repulsive force induced by its electric charges between particles.
• This Coulomb Interaction is named after Charles-Augustin de Coulomb, a French physicist.
• The Electrostatic Force is one of nature's four basic forces. We make use of the Coulomb Law to overcome the forces generated by charging configurations.

Magnetic force:

• Magnetic force, attraction or repulsion which occurs because of their motion between electrically charged particles.
• The magnetic force between two moving charges can be defined as the effect that one magnetic field produced by the other exerts on either charge.

Force of gravity:

● The Universal Law of Gravitation says that any two objects having mass will attract each other with a force which is directly proportional to the product of their masses.