Building a mousetrap car for my engineering class -- Help please

  • #1
Summary:: My back wheel spins when in the air, but wont when on the ground, help!

My car has two four inch wood wheels on the front and a 12 inch wood wheel on the back, they are securely attached to the axel and I have 1/2 inch ball bearings to connect the axel to the frame. My lever arm is about 18 inches long. I have scoured the internet for an answer but I just cant seem to find why it wont spin while on the ground.
 

Answers and Replies

  • #2
berkeman
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Welcome to PF.

Can you post some pictures? Use the "Attach files" link at the bottom of the Edit window to upload JPEG or PDF files.
 
  • #3
Lnewqban
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Welcome!
Could each of the bearings be not in perfect alignment with the axle?
What if you slightly push the car forward?

 
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