LIFT: Back Spin LIFT: Top Spin

1
LIFT Back Spin LIFT Top Spin

• Bottom of ball moving toward the direction of the
  balls flight
• lower flow on bottom
• higher flow on top
• FLIFT UPWARD

• Top of the ball moving toward the direction of
  the balls flight
• lower flow on top
• higher flow on bottom
• FLIFT DOWNWARD

2
Back Spin Ball Drops _at_ an ? to floor
3
Back Spin Ball Drops _at_ an ? to floor

• Bottom of ball moving toward flight direction
• Ball has both horizontal and vertical motion
• ball spin rubs floor in a horizontal direction
  that decelerates the balls forward motion
• Result ? horizontal ? vertical motion
• ? Rebound ? is higher than drop ?

4
Top Spin Ball Drops _at_ an ? to floor
5
Top Spin Ball Drops _at_ an ? to floor

• Top of ball moving toward flight direction
• Ball has both horizontal and vertical motion
• ball spin rubs floor in a horizontal direction
  that accelerates the balls forward motion
• Result ? horizontal ? vertical motion
• ? Rebound ? is lower than drop ?

6
Back Spin Basketball Bank Shot
7
Back Spin Basketball Bank Shot

• Backboard is on a vertical plane
• Ball Drops _at_ an ? to board with Back Spin
• same reaction as a top spin ball off floor

8
Different View of Backboard
Ball coming into backboard with top spin
9
Side Spin Ball Hits Straight On
10
Side Spin Ball Hits Straight On

• Lateral spin pushes horizontally against
  wall/rail
• a reaction force in the opposite direction of the
  spin
• ball rebound ? is in the direction of the
  reaction force