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Page 3
1. Why did you need to measure the speed of the person before they start skidding?
That velocity will be the starting velocity at the beginning of skidding from which the person
will slow down to a stop.
2. Why does acceleration come out to be negative?
The person is slowing down initially in the chosen positive direction.
3. How do you setup Newton's 2nd law for the skidding scenario?
Force of kinetic force is the only force slowing down the person in the x direction when he is skidding, so
a
x
= ∑ F
x
Pucks to Socks: Test Your Understanding
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