Questions to do with crankshaft of an engine

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The discussion revolves around calculations related to the crankshaft and piston dynamics in a truck engine. Key calculations include determining the instantaneous force on the piston due to combustion pressure, the angle OAB, and the projection of the force transmitted to the connecting rod. There is confusion regarding whether to calculate torque or force based on the phrasing of the questions, leading to a need for clarification from the instructor. Additionally, the calculations for rotational velocity and power output of the crankshaft at 1500 RPM are confirmed to be correct. The overall complexity of the questions and their interdependencies has caused significant confusion among participants.
  • #31
CWatters said:
Correct.
No. The hypotenuse is larger than the other sides of the triangle. How can a component be greater than the whole?

It's possible you are confusing the mechanical geometry (where the con rod does look like the hypotenuse) with a vector component diagram where it isn't.

Consider this diagram..

View attachment 76882

I have marked a vector Fp and shown it's components in the X and Y directions. Does that make sense?
That makes sense now entirely! I see, thank you for all your help :) is there a way I can give you rep or something on this forum?
 
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  • #32
No worries. Happy Christmas!
 
  • #33
Merry Christmas! Have a good'n! Hope santa brings you lots of nice physics things! :P
 

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