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Q.

Which of the following are example(s) of non-contact force?


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a

Muscular force

b

Gravitation force

c

Magnetic force

d

Both (2) and (3) 

answer is D.

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Detailed Solution

Concept: Two different sorts of forces exist (1). Contact pressure (2). force without touch
Any force that causes motion between two surfaces to come into contact and produces a contact force is referred to as a contact force.
A force that works on things without making physical touch is referred to as a non-contact force.
Therefore, out of the alternatives above, gravitational force and magnetic force are non-contact forces since two objects do not need to come into touch.
Let's look at an example of magnetic force using magnets. When two magnet bars are placed close to one another with their north poles facing in opposite directions, they will attract each other because unlike poles attract, but when they are placed in opposition to one another, they will repel one another because poles repel one another.
If we take an old incident when Newton, while sitting beneath an apple tree, saw a ripe apple that had fallen from the tree, he came up with the term "gravitational force" to describe the force that caused the apple to fall.
Therefore, we view this force as an attraction between two mass-containing objects. This force unites two items.
Hence, the correct option is 4.
 
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Which of the following are example(s) of non-contact force?