You are standing up straight on a mini-trampoline with your upper limbs stretched out horizontally in front of you, holding 2.5-kg weights in each hand. Maintaining this position, you attempt to bounce up in the air, rotate 180 degrees around your longitudinal axis and land back on the trampoline. It is difficult, although possible, to complete this movement because:Question 8Select one:a.more mass is distributed away from the axis of rotation in this position which increases your linear inertia making it difficult to rotateb.you have to generate more angular momentum after you leave the mini-trampoline and while you are in the air so that you can obtain sufficient angular velocity to complete the turnc.you have to use gravity as the external force to assist you to rotate around your longitudinal axis and this increased linear inertia makes it difficult to rotated.none of the statements are true
Question
You are standing up straight on a mini-trampoline with your upper limbs stretched out horizontally in front of you, holding 2.5-kg weights in each hand. Maintaining this position, you attempt to bounce up in the air, rotate 180 degrees around your longitudinal axis and land back on the trampoline. It is difficult, although possible, to complete this movement because:Question 8Select one:a.more mass is distributed away from the axis of rotation in this position which increases your linear inertia making it difficult to rotateb.you have to generate more angular momentum after you leave the mini-trampoline and while you are in the air so that you can obtain sufficient angular velocity to complete the turnc.you have to use gravity as the external force to assist you to rotate around your longitudinal axis and this increased linear inertia makes it difficult to rotated.none of the statements are true
Solution
The correct answer is a. More mass is distributed away from the axis of rotation in this position which increases your linear inertia making it difficult to rotate.
This is because when you hold weights in your hands and stretch your arms out, the mass is distributed further from your axis of rotation (which is your longitudinal axis in this case). This increases your moment of inertia, which is the rotational equivalent of mass for linear motion. The greater the moment of inertia, the more torque (rotational force) you need to start rotating or to change your rotation. Therefore, it becomes more difficult to complete the 180-degree rotation.
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