Forces while walking and driving

[troy611]

i am confused about the exact forces in play while we walk and while a car is driven, can anybody please show me a free body diagram regarding these with explanation? Also, which force does work when we walk?

Thnx

 

[tiny-tim]

Welcome to PF!

Hi troy611! Welcome to PF!

i am confused about the exact forces in play while we walk and while a car is driven, can anybody please show me a free body diagram regarding these with explanation?

Friction against the ground, in both cases.

(plus, in normal walking mode, though not essential, falling very slightly onto each succeeding step)

Also, which force does work when we walk?

You tell us … how is work done defined?

 

[boit]

The knee is always slightly flexed when walking. Also there are three fulcrum in human body as a machine, ankle joint, knee joint and hip joint. the pelvis also rotates in an important way. In a car wheel there is only one fulcrum traditionaly believed to be the hub. I have my own idea where the fulcrum should be. To me the hub is actually the load arm, axel effort and tire circumference the fulcrum. This observation though is not so popular

 

[troy611]

ohk...thanks everyone for helping out