# Mousetrap car

A mousetrap car designed for a distance rival illustration of Mousetrap car motion A mousetrap car is a minor vehicle whose lone beginning of motivative power is a mousetrap. Variations include the function of multiple traps, or identical big informer traps, for add baron. Mousetrap cars are frequently used in physics or other physical skill classes to help students build problem-solving skills, develop spatial awareness, learn to budget time, and practice accommodative demeanor.

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## design

The general manner for a mousetrap car varies. [ 1 ] [ 2 ] A issue of commercial vendors offer plans, kits and arrant cars for sale. [ 3 ] [ 4 ] [ 5 ] [ 6 ] In summation to mousetrap cars, contests have been created for mousetrap boats. [ 7 ] and mousetrap airplanes. [ 8 ]

### spring ability

A mousetrap is powered by a coiling torsion jump. Torsion springs obey an angular form of Hooke ‘s law :

τ = − κ θ { \displaystyle \tau =-\kappa \theta \, }

where τ { \displaystyle \tau \, } is the torsion exerted by the jump in newton -meters, and θ { \displaystyle \theta \, } is the angle of kink from its chemical equilibrium position in radians. κ { \displaystyle \kappa \, } is a constant with units of newton-meters / radian, variously called the spring ‘s torsion coefficient, torsion elastic modulus, or barely spring constant, equal to the torsion required to twist the form through an slant of 1 radian. It is analogous to the give constant of a linear spring. The energy of U, in joules, stored in a tortuosity give is :

U = 1 2 κ θ 2 { \displaystyle U= { \frac { 1 } { 2 } } \kappa \theta ^ { 2 } }

When a mousetrap is assembled, the leap is initially twist beyond its equilibrium position so that it applies significant torsion to the bar when the trap is closed .

### power transmission to axle

This apparent motion must be used to turn the car ‘s axle or wheels. The most coarse solution is to attach a string to the mouse trap ‘s branch and then wrap it around an axle. As the measure is released, it pulls on the string, causing the axle ( and wheels ) to turn. Tying the string directly to the mousetrap ‘s banish, however, will not make good use of the energy stored in the leap. The distance between the opened and closed positions of the bar of a mousetrap is typically 10 curium, so this is how much string would be pulled. Wrapped around even a belittled diameter axle, this sum of drawstring will not create enough revolutions to move the cable car adenine far as it might go. To get around this problem, most mousetrap cars add a lever to the prevention so that the pry will pull a much greater length of string and cause the axle to turn many more revolutions .

### clash of wheels

Another rationality to add a lever to the mousetrap bar is to reduce the come of torsion applied to the wheels. If excessively much torsion is applied to the wheels, the violence between the wheels and the establish will exceed the maximal frictional wedge due to the coefficient of clash between the wheel and land surfaces. When this happens, the wheels slip and energy stored in the leap is wasted. Using a long lever on the mousetrap bar reduces the tension in the string due to the form ‘s torsion, and frankincense reduces the torsion applied to the car ‘s wheels.

In summation to reducing the torsion applied to the wheels, the coefficient of friction may be improved by using higher friction materials .

### distance car

Making this type of car revolves around having the most violence from the spring transferred to the lever weapon and making the drive axle rotate. In order to get the most distance out of your car, you must make the lever sleeve hanker. This allows the car to get more rotation out of the wheels because of the longer string that will come along with a longer pry arm. then make the driveway wheels larger because the higher the diameter of the rack the more grind it covers. Along with this hold certain to have the axles smaller than the bicycle so there can be more pull distance. Reduce the most friction you can because the more friction the more energy is lost in propelling the car. Mass should besides be taken into account, the more the car weighs the more energy from the mousetrap spring will be used so it ‘ll be best to make the car light weight .

### speed car

Making a rush sneak trap cable car involves extracting the most energy you can from the mousetrap spring in a short distance. The lever branch needs to be shorter than the distance car ‘s because the shorter the arm is, the quick the spring will snap, and therefore more torsion gets extracted from the form. Most of the car ‘s weight is distributed to the back, where the drive axle is located. Built this way, the car will not have much drag in the front, slowing it down. The wheels do n’t need to be excessively large but the axle should be larger in relation to the roulette wheel. The wheels need good grip because without the right total of friction the wheels attached to the drive axle will slip and not push the cable car forwards because of all the add torsion .

## References

• Mousetrap Car Demonstration of a mousetrap powered car
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