Question

A lacrosse ball and a tennis ball are approximately the same size, but the lacrosse ball has more mass. Using purely conceptual reasoning (do not rely on equations), apply the vector nature of momentum and the law of conservation of momentum to explain in your initial post to the discussion what happens when

a lacrosse ball rolls into a resting tennis ball
a tennis ball rolls into a resting lacrosse ball
Think about the initial momentum vector and the fact that the fall that was initially at rest will move after the collision. Relate your conclusions to everyday examples such as an automobile collision or hockey players colliding on the ice.

Answer 1

In first case , the moving tennis ball collide to resting lacrosse then tennis ball will definitely start moving in backward direction.

But when lacrosse ball collide to the tennis ball it can move in the forward direction or can move in the backward direction depending on the how much is the mass of laccrose ball higher than tennis ball.

Same can be scene if a truck collide with the motorcycle both will move in the direction of truck but when case is vice versa than motorcycle will move backward after collision.

Hope this will help, please rate the answer!