We learned more about dynamics this week. We learned about friction force and so on. Running sure is full of dynamics because running also involves friction force (kind of obvious but). In order to run, i need friction. Otherwise it will be impossible to go uphill. What enables me to kick off the ground is friction. When I'm running, i never go past my shoes' max friction force. I know this because I never slip when I'm emitting force as i try to run. If my shoes had very little maximum friction force, i would not be able to put that much force to run.
Also, another example would be the tire of a car. While i was in my friend's car, i noticed that the car's tire's maximum friction force is insane. Insane because the car was parked on a steep hill (around 50-65 degrees compared to flat ground). Normally, objects would slide down the hill but since the tire's friction is great, the car stays where it was parked. I forget but i remembered that in the reading it said that the car's tire's friction coeffiecient was around .87 or something like that.
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