Building Mouse Trap Cars for Physics Exams: Tips and Hints

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SUMMARY

This discussion focuses on building mouse trap cars for physics exams, emphasizing the use of a mouse trap as the sole energy source. Key design elements include utilizing a cardboard trough with a mousewheel connected to axles that drive rubber wheels, which can be sourced from R/C hobbyist shops. The design avoids the need for gears by allowing the mouse's running to directly rotate the wheels. For energy storage, a more complex system involving a spring mechanism is suggested, though caution is advised to prevent unintended consequences.

PREREQUISITES
  • Understanding of basic physics principles related to motion and energy transfer
  • Familiarity with mechanical components such as axles and wheels
  • Knowledge of low friction support systems
  • Experience with simple mechanical design and assembly
NEXT STEPS
  • Research the mechanics of energy transfer in simple machines
  • Explore designs for spring mechanisms to store energy
  • Investigate low friction materials and their applications in mechanical systems
  • Learn about the principles of motion in relation to wheel and axle systems
USEFUL FOR

This discussion is beneficial for students preparing for physics exams, educators teaching mechanical principles, and hobbyists interested in building simple machines for educational purposes.

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Does anyone have any tips on how to make/build a mouse trap car, with the mouse trap being the only source of energy? I have an idea of what it should look like, and how it should work, but I'm really not sure. Is there any helpful hints that I might need while building my project for my physics exam?
 
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The easiest way would be to use the mouse cage itself as a pair of wheels...but I don't think this is the conventional design, nor will it be very comfortable for the mouse, having to deal with irregularities of the road directly. :biggrin:
 
Where's the difficulty. Just use a little cardboard trough, with a mousewheel in the center connected on either side to axles that are in turn connected to rubber wheels (that you can purchase in an R/C hobbyist shop). The axle is supported using a low friction support of some sort. The mouse faces the forward direction of the "car" (lets say that lies to the left of our view), and its running causes a counterclockwise rotation of the mousewheel that then rotates the wheels counterclockwise, driving the car forward.

So it's simple, you don't even need a system of gears to change the directions of rotation. However, if you wanted to store the mouse's energy, you'd need a more complicated contraption with a spring that gets wound up with the forward motion of the mouse, and then releases its energy when it stops. You'd have to find a way to disengage the mouse wheel before energy release happens, otherwise you'll get a car full of mouse puke. :smile:
 

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