Calculating Potential Energy in a Rotary Mousetrap Spring System

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SUMMARY

The discussion focuses on calculating the potential energy (PE) in a rotary mousetrap spring system, specifically addressing the relationship between the angle of the spring and the energy stored. The potential energy is derived using the equation PE = ½k(rΘ)^2, where k is the spring constant, r is the radius, and Θ is the angle in radians. The conversation confirms that the spring in a mousetrap is typically a torsion spring, leading to the alternative expression for potential energy as PE = ½kθ², where τ represents torque.

PREREQUISITES
  • Understanding of potential energy calculations in mechanical systems
  • Familiarity with torsion springs and their properties
  • Knowledge of calculus, specifically integration techniques
  • Basic physics concepts related to torque and angular displacement
NEXT STEPS
  • Study the principles of torsion springs and their applications in mechanical systems
  • Learn about the derivation of potential energy formulas in rotational dynamics
  • Explore experimental methods to measure spring constants in torsion springs
  • Investigate the relationship between torque and angular displacement in mechanical systems
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Physics students, mechanical engineers, and anyone interested in the mechanics of rotary systems and energy calculations in springs.

JLT
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Homework Statement



Calculate the potential energy created by the spring in the mousetrap as a function of the angle the spring is pulled back.

Homework Equations



PE = ∫Fdx = ∫ kxdx = ∫k rΘ rdΘ ??

The Attempt at a Solution



Is this a linear spring? we can use x = rΘ, and dx = rdΘ, so PE = ½k(rΘ)^2

↑↑ does that look good to everyone, or is there a better soln to this?
 
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Is this an experiment? What measurements could you take to help determine if it is linear and to determine k?
 
JLT said:
the spring in the mousetrap
Is there a diagram with this?
It sounds like a so-called torsion spring. Mousetraps generally use those.
 
OK, although for a rotary system the spring constant is usually given as τ = kθ, τ = torque, then
p.e. = 1/2 kθ2.
 

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