Question

Which one of the following forces is a contact force?

• A. force of gravity
• B. force of friction
• C. magnetic force
• D. electrostatic force

Answer 1

The correct option is B

force of friction

The explanation for the correct option:

Contact force:

1. A contact force is any force that necessitates contact.
2. Contact forces are present everywhere and are responsible for the majority of visible interactions between macroscopic collections of matter.
3. Contact forces are used in everyday activities such as pushing a car up a hill or kicking a ball across a room.
4. Friction is the force that a surface exerts against the motion of a body across its surface.
5. Gravitation is an attractive force that exists between all bodies with mass.

Hence, Option(B) is correct.

The explanation for incorrect options:

1. Magnetic forces are non-contact forces that pull or push on objects without making contact with them.
2. Non-contact forces, such as electrostatic forces, pull or push on objects without touching them.

Hence, Option(A),(C) and (D) are incorrect.

Hence, Option(B) is correct.