The answer to the first one is sublimation.
A decrease in mass will decrease an objects weight because
weight = mass x gravitational constant
When a footballer collides with the goal post, the forces at work are the action and reaction forces. The player will exert an action force on the goal post, and then a reaction force from the goal post will stop the player. The reaction force call will cause pain and even injury to the player.
Answer:
You know the saying "Opposites attract" well that is how you can remember that South and North Magnetic Poles connect.
Explanation:
Hope this helps ya
