Question

Which of the following is not an example of muscular force?
A. a porter carrying a loadon a wheel-barrow.
B. an apple falling from a tree.
C. a child ridinga bicycle.
D. a person drawing water from a well.

Answer 1

An apple falling from a tree is not an example of muscular force. Here the type of force is gravitational force offered by the earth.

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Answer 2

B. an apple falling from a tree.

Explanation:

Muscular force is the force exerted by physically exerting ones muscle. A porter carrying a load, child riding a bicycle and a person drawing water from a well are all done using muscle power. This is a contact force. However, an apple falling from a tree falls to the ground due to gravitational force. Gravity is exerted by the Earth on the apple. It is a non-contact force.

Option B is the answer.