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A simple and practical understanding of conservation of momentum problems is given by the following: When a figure skater makes a jump, he increases his rotation speed by pulling together his arms and legs. This reduces his rotational inertia causing him to spin faster. If the initial spin rate of a figure skater is 1 RPM and he decreases his rotational inertia by half during the spin, what is his final spin rate?

A simple and practical understanding of conservation of momentum problems is given by the following: When a figure skater makes a jump, he increases his rotation speed by pulling together his arms and legs. This reduces his rotational inertia causing him to spin faster. If the initial spin rate of a figure skater is 1 RPM and he decreases his rotational inertia by half during the spin, what is his final spin rate?

Grade:12

1 Answers

Nirmal Singh.
askIITians Faculty 44 Points
10 years ago
By conservation of momentum
I1 w1 = I2 w2
I1 =I and I2 = I /2
w1 = 1 rpm and w2 =?
I * 1 = I/2* w2
w2 = rpm
Thanks & regards
Nirmal Singh
Askiitians Faculty

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