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

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SUMMARY

The discussion centers on troubleshooting a mousetrap car design where the back wheel spins freely in the air but fails to do so when on the ground. The car features two four-inch wood wheels at the front and a twelve-inch wood wheel at the back, utilizing 1/2 inch ball bearings for axle connection. Potential issues identified include misalignment of the bearings with the axle and the need for additional force to initiate movement. Participants suggest posting images for better diagnosis and recommend testing the car's movement by pushing it slightly forward.

PREREQUISITES
  • Understanding of basic physics principles related to motion and friction
  • Familiarity with mechanical components such as axles and bearings
  • Knowledge of mousetrap car design and construction techniques
  • Experience with troubleshooting mechanical issues
NEXT STEPS
  • Research proper alignment techniques for axles and bearings in model vehicles
  • Explore methods to reduce friction in wheel assemblies
  • Learn about the physics of lever arms and their impact on motion
  • Investigate common design flaws in mousetrap cars and their solutions
USEFUL FOR

This discussion is beneficial for engineering students, hobbyists building mousetrap cars, and educators seeking practical insights into mechanical design and troubleshooting.

unknown5174
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Summary:: My back wheel spins when in the air, but won't 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 can't seem to find why it won't spin while on the ground.
 
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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.
 
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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