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Answer :
Final answer:
When a gymnast balances on a balance beam, the forces of gravity and the normal force from the beam are at work. These forces can be described as balanced when the downward gravitational force equals the upward normal force. This equilibrium allows the gymnast to maintain their position without moving up or down.
Explanation:
Forces at Work on a Gymnast on a Balance Beam
When a gymnast balances on a balance beam, several forces come into play, particularly the force of gravity and the normal force exerted by the balance beam. Let's explore these forces:
- Gravity: This force pulls the gymnast downward, acting on their center of mass. It is determined by the gymnast's weight.
- Normal Force: This is the upward force exerted by the balance beam, which counteracts the force of gravity.
In a balanced position, the forces are said to be balanced because the weight of the gymnast (gravity pulling down) equals the normal force (balance beam pushing up). This means:
- The downward force due to gravity is equal to the upward force provided by the balance beam.
- When the forces are equal, the gymnast does not accelerate up or down; they remain in equilibrium on the beam.
Therefore, the correct statement from the options given is: Forces are balanced when gravity pulling down equals the balance beam force pushing up.
Learn more about Forces and Equilibrium here:
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