Kinesiology 2241A/B Lecture Notes - Lecture 27: Weightlessness, Ski Jumping, Tennis Ball

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2241A/B
• Professor: Thomas Richard Jenkyn

Document Summary

When runners of cyclists move through the air, they are continuously overcoming air resistance (which we know is really drag) A sprinter running a 10 second 100 m run pace is working against about 6-8 lbs of drag. A cyclist, since they are moving faster and drag goes up as the square of velocity, experiences more drag. When traveling in a pack, you can draft. Cyclists take it in turns to be the leader who does the most work. The drag coefficient (cdrag) is dependent on the body positioning of the cyclist. The most upright has the highest drag force. A race position has the smallest drag force, but is far less comfortable. The angle between the velocity vector and the horizontal ground is called the projection angle. Note that the projection angle does not need to be the same as the angle that the object makes with the ground.