Question

An example for a contact force is
)
A) Falling of fruits from a tree.
B) Attraction of an iron nail by a magnet.
C) Attraction of pieces of paper by a balloon when they are bought near the balloon
D) Writing with a pen.
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Answer 1

${\huge{\underline{\rm{\blue{ANSWER}}}}}$

The Correct answer is ${\huge{\rm{\red{D}}}}$.

The First Option is Wrong:-

• It is a Gravitation force, Hence Non - Contact force. The earth and Apple attract each other but due to smaller mass the apple get attracted towards earth and Hence fallen down.

The Second Option is Wrong.

• It is Magnetic force, Hence, Non contact force. The magnet has a large force of attraction than a small piece of iron nail. Hence get attracted toward Magnet.

The third option is wrong.

• It is electrostatic force, Hence, Non - Contact force. The Positively charged fibre get attracted toward negatively charged Balloon.

The Fourth option is correct.

• It is Contact force. Because here, the object has been in contact with the writer.

Answer 2

Answer:

D) Writing with a pen .

because contact force is a type force that needs contact to occur.