2007-06-20 06:13:03 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
To add a little, the force that really makes the ball move to the right is friction.
If the wall was frictionless, so a really really really slippery wall of ice, the ball would just bounce straight back.
Have you ever thrown a basketball ahead of you but with backspin? Sometimes it shoots back at you fast and sometimes it kind of bounces straight up..and then back to you. Its because of friction.
The spin of the ball interacts with the ground and the ground pushing against that spin. When the ball shoots back at you fast the force caused by the friction of the spinning ball is greater than the horizontal force you put on it when you threw the ball forward.
When the ball kind of bounces straight up and doesn't really move, the force created by the sprinning ball & friction in effect equals the horizontal force you threw the ball with.
If the ground was totally frictionless, a super incredibly slippery ground the ball would keep bouncing and bouncing no matter how much spin you put on it.
Sam concept only the ground is now the wall. Just rotate everything in your head.
2007-06-20 06:56:22 · answer #1 · answered by thoughtdream 2 · 1⤊ 0⤋
To add to the first answer:
Imagine that there is a set point on the ball that is going to hit the wall. That point has clockwise acceleration, and is traveling exactly to the right when it hits the wall. The wall not only takes this impact, but gives it back b/c of Newton's 3rd law, equal and opposite.
If ball exerts rightward force on wall, wall exerts leftward force on ball.
Thus, the wall pushes the ball leftward, and the ball rotates counterclockwise.
2007-06-20 13:45:33 · answer #2 · answered by J Z 4 · 0⤊ 1⤋
Laws of physics.
Every action causes an equal and opposite reaction.
2007-06-20 13:21:04 · answer #3 · answered by Philip H 7 · 0⤊ 1⤋