Here are some videos on balanced and unbalanced forces affecting the motion of objects. The first clip examines the forces on a cyclist as she cycles round a velodrome.
httpv://www.youtube.com/watch?v=WoTQDrzCqb0
The second clip looks at the way skydivers use forces to land safely.
httpv://www.youtube.com/watch?v=io-6uYOQK6A
I’ve also attached a pdf with some notes on forces, free body diagrams and Newton’s laws of motion. Download the file using the link below.
E-Book PDF: Open in New Window | Download