Question 15

A picture hanging on a nail, a person sitting on a chair, and a boat floating on water are examples of forces occurring in opposite directions to reach a state of equilibrium.

In each of these scenarios, opposing forces balance each other out, allowing for a stable state. This balance is crucial in maintaining equilibrium.

A) A picture hanging on a nail

This is a classic example of equilibrium, where the gravitational force pulling the picture down is balanced by the upward force exerted by the nail. The forces acting on the picture are equal and opposite, resulting in no movement.

B) A person sitting on a chair

When a person sits on a chair, their weight exerts a downward force due to gravity, which is counteracted by the upward normal force from the chair. This balance of forces allows the person to remain seated without falling through the chair.

C) A boat floating on water

A floating boat experiences gravitational force pulling it downwards and an equal buoyant force pushing it upwards from the water. These two opposing forces achieve equilibrium, allowing the boat to float steadily on the water's surface.

D) A moon orbiting a planet

While a moon in orbit experiences gravitational attraction towards the planet, it is also moving forward due to its tangential velocity. This scenario involves centripetal force and is not an example of forces in direct opposition leading to a state of equilibrium, as it is a dynamic balance rather than static.

Conclusion

The correct examples of equilibrium forces are A, B, and C, as they all showcase static situations where opposing forces are balanced. In contrast, option D illustrates a dynamic scenario where forces are in constant motion rather than achieving a state of rest. Thus, A, B, and C definitively demonstrate the principle of forces acting in opposite directions to maintain equilibrium.