9-1

http://twyfordigcsephysics.blogspot.co.uk/2013/01/terminal-velocity.html

9-1

http://twyfordigcsephysics.blogspot.co.uk/2013/01/parachutes-and-freefall.html

9-2

http://twyfordigcsephysics.blogspot.co.uk/2013/01/terminal-velocity.html

9-2

http://twyfordigcsephysics.blogspot.co.uk/2013/01/parachutes-and-freefall.html

9-1

http://twyfordigcsephysics.blogspot.co.uk/2013/01/stopping-distances.html

9-1

friction

9- 2

http://twyfordigcsephysics.blogspot.co.uk/2013/01/stopping-distances.html