First slide

Second 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

Moderate

A

frictional force along westward.
B

muscle force along southward.
C

frictional force along south-west.
D

muscle force along south-west.

Solution

In figure, $OA = p_{1} =$ initial momentum of player northward.
$OB = p_{2} =$ final momentum of player westward.
According to triangle
law of vectors,
$OA = AB = OB$
$OA = OB = OA = p_{2} - p_{1} = change in momentum$
The change in momentum of player is along southwest.
As motion is due to frictional force of reaction of the ground, therefore, force that acts on the player is frictional force along south west.

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