Biomechanical principles and stability：練習問題

Which of the following adjustments would most effectively increase the stability of a rugby player when preparing to engage in a scrum?

In the force-time graph shown for a sprinter, what does the area under the curve represent?

A diver performing a tucked somersault moves into an extended body position just before entering the water. What is the impact of this transition on their moment of inertia and angular velocity?

To maximize stability when a judo athlete is preparing to be attacked, they should aim to do which of the following?

A second-class lever system, such as the ankle joint during a calf raise, provides a high mechanical advantage. Why is this the case?

Based on the diagram provided, identify two specific physical adjustments the athlete has made to their body position to increase their stability.

A gymnast transitions from an extended body position into a tucked somersault. Using the principle of conservation of angular momentum, where \( \text{Angular momentum} = \text{moment of inertia} \times \text{angular velocity} \), explain why their angular velocity increases during the tuck.

In terms of Newton's Laws of Motion, explain why a sprinter remains stationary in the blocks until the starting gun is fired.

A gymnast performs a static balance as shown in the diagram.

(a) Identify two physical factors that would increase the gymnast's stability in this position.
(b) With reference to the diagram, explain the relationship between the line of gravity and the base of support required to maintain balance, and describe the effect on the gymnast's stability if the line of gravity moves outside the base of support.

The diagram illustrates the lever system operating at the ankle joint during the take-off phase of a jump.

(a) Identify the class of lever functioning during this movement and state the anatomical structures acting as the fulcrum, effort, and resistance.
(b) Using the effort arm and resistance arm measurements provided in the diagram, calculate the mechanical advantage of this lever system.
(c) Explain the functional benefit of this specific mechanical advantage for a basketball player during take-off.