Final answer:
To minimize elbow extension (triceps), we need to decrease the torque created by the triceps muscle. This can be achieved by decreasing the force exerted by the triceps muscle or by increasing the lever arm distance.
Step-by-step explanation:
To minimize elbow extension (triceps) in the presence of gravity, you need to understand the concept of torque. Torque is the product of force and the lever arm. Since the triceps muscle extends the forearm, to minimize elbow extension, we need to decrease the torque created by the triceps muscle. This can be achieved by decreasing the force exerted by the triceps muscle or by increasing the lever arm distance.
For example, if a person is holding a book with their forearm and the biceps are exerting a force to support the weight of the forearm and the book, the triceps can be assumed to be relaxed. By viewing the mechanical system with the pivot at the elbow joint, we can understand that the force exerted by the triceps muscle can be decreased to minimize elbow extension.
By controlling these factors, we can minimize the elbow extension caused by the triceps muscle in the presence of gravity.