Which of the following is not a correct example of muscular force ?

Question

Accepted Answer

Option 3 is the correct answer because it describes a scenario where muscular force is not directly responsible for the action described. In this scenario, a person stops rowing a boat, and the boat eventually comes to a stop after traveling some distance. The key point here is that the boat's movement and eventual stop are due to inertia and friction (water resistance), not muscular force. When the person stops rowing, they are no longer applying muscular force to propel the boat. Instead, the boat continues to move due to its inertia and gradually slows down due to the frictional force of the water, which is not a result of muscular force.

Now, let's explain why each of the other options is incorrect:

1. **Option 1**: A person lifting a bucket of water placed on the ground with both his hands involves muscular force. The person uses their muscles to exert force on the bucket to lift it against the force of gravity. This is a direct application of muscular force.

2. **Option 2**: A person lifting a book on the table with both his hands also involves muscular force. Similar to Option 1, the person uses their muscles to apply force to the book to lift it from the table, which is a clear example of muscular force in action.

3. **Option 4**: A person pushing a table placed on the floor with both his hands is another example of muscular force. The person uses their muscles to exert force on the table to move it across the floor. This action directly involves the application of muscular force.

In summary, Option 3 is the correct answer because it describes a situation where the cessation of muscular force leads to the boat stopping due to external forces like friction, rather than muscular force itself. The other options clearly involve the application of muscular force to perform the described actions.