Question

Identify whether it is a contact force or a non-contact force. Also, name the force in action.

Bringing two similar poles of the magnet towards each other

A ball falling freely from the top of the building.

Leaves falling from a tree

Spinning a wheel

Swinging the child up in the air

Accepted Answer

(a) Bringing two similar poles of the magnet towards each other: We know that like poles repel each other and the magnetic force will push them apart. However, opposite poles attract each other and the magnetic force will push them together. The force between them is non-contact force and magnetic force.
(b) A ball falling freely from the top of the building: The ball falling freely in the virtue of gravity towards the earth is due to the gravitational force. It is a non-contact force.
(c) Leaves falling from a tree: Leaves falling from a tree is an example of non-contact force. The object falling in the virtue of gravity towards the earth is due to the gravitational force.
(d) Spinning a wheel: For spinning a wheel the object and the body should come in contact with each other. So It is a contact force. The force required for spinning a wheel is muscular force.
(e) Swinging the child up in the air: For swinging the child up in the air the body should come in contact with the swing. So it is a type of contact force. The force in action is a muscular force.
The activities such as pulling, pushing, lifting, and walking are performed by humans with the help of muscular forces.

Natasha Mehta Solutions for Exercise 1: WORKSHEET

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