Concept explainers
Why does bending your legs when running enable you to swing your legs to and fro more rapidly?
The reason that bending the legs when running enables a person to swing the legs to and fro more rapidly.
Answer to Problem 6A
It reduces the rotational inertia of the legs which enables the swinging of legs to and fro more rapidly.
Explanation of Solution
Introduction:
The more the rotational inertia of an object, the more difficult it is to change its rotational speed.
It is known that the more the distance of the mass’s concentration from the axis of rotation, the more is the rotational inertia of the object. Thus when the legs are bend when running, it will reduce the rotational inertia about the axis and thereby it will become easier to swing the legs to and fro.
Conclusion:
Hence, bending the legs reduces the rotational inertia and then it becomes easier to change the rotational speed of the legs.
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Conceptual Physics: The High School Physics Program
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