Question

Define contact forces and non-contact forces with suitable examples. Identify the contact and
non-contact forces from the following forces:
(a) Frictional force
(b) Normal reaction force
(c) Force of tension in a string (d) Gravitational force
(e) Electrostatic force
(f) Magnetic force
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Answer 1

Answer:

When you jump, you always return back to the surface. Why? Is there anything that is holding your feet when you try to jump? When you throw a ball high up in the air, it reaches the highest point and then it invariably return back to its thrower on the ground. These occurrences can be explained by the non-contact force. A non-contact force is a force applied to an object by another body that is not in direct contact with it. Non-contact forces come into play when objects do not have physical contact between them or when a force is applied without any interaction. When compared to the types of contact forces, there are very few non-contact forces.

Contact force occurs due to the contact between two different objects.

Explanation:

normal reaction forces are not the non-contact forces