Question

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponet. The force that acts on the player is.
A. Frictional force along westward.
B. muscle force along southward.
C. frictional force along south-west.
D. muscle force along souoth-west.

Answer 1

Correct Answer - C
In figure, `vec(OA)=vec(p)` =initial momentum of player northward.
`vec(OB)=vec(p_(2))` =final momentum of momentum of player westward.
According to triangle law of vectors,
`vec(OA)=vec(AB)=vec(OB)`
`vec(OA)=vec(OB)-vec(OA)=vec(p_(2))-vec(p_(1))` =change in momentum
The change in momentum of player is along south-west.
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.