First slide

Third law

Question

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is

Easy

A

frictional force along westward
B

muscle force along southward
C

frictional force along south-west
D

muscle force along south-west

Solution

Consider the adjacent diagram
Let OA = p₁ = Initial momentum of player northward
AB = p₂ = Final momentum of player towards west.
Clearly, OB = OA + AB
Muscle force (AR) = Change in momentum = p₂ - p₁
= AB - OA = AB + (-OA)
Clearly, resultant AR will be along south-west.

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