Why is the motion of a piston considered to be simple harmonic motion?

  • #1
I know this is simple, but I don't fully understand why the motion of a piston is considered to be simple harmonic? Wouldn't the piston and connecting rod have mass?
 

Answers and Replies

  • #2
russ_watters
Mentor
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What does their mass have to do with anything?
 
  • #3
311
23
With an infinitely long connecting rod, you would have comparable acceleration and velocity values for the piston and crank pin.
 
  • #4
Khashishi
Science Advisor
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493
A piston can have any motion you want. Are you talking about some very specific application of a piston?
 
  • #5
7
0
Simple harmonic motion is for small vibrations in an isolated system(free from damping forces). If you have a pendulum of mass 20g it can also undergo shm. Mass just affects it's time period. A piston can also undergo shm.
 

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