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Engineering
Mechanical Engineering
Torque requirements for launching a soccer ball
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[QUOTE="jrmichler, post: 6581942, member: 638574"] I did not look at your attached file. We prefer that you use LaTeX to put your calculations in your post. That said, the approach you listed makes sense. The wheels will slow down, so the ball velocity will be the velocity after momentum is transferred. There is an assumption that wheel spacing and wheel to ball friction will be sufficient to get the ball up to the wheel velocity. Note that momentum is conserved, while kinetic energy is lost in this system. If the wheels are several times heavier than the ball, then the wheel RPM drop will be small. You can then simplify your calculations by calculating only the torque needed to get the wheels back up to speed after throwing a ball. Were you planning on driving will electric motors? If so, be aware that most electric motors heat up rapidly if the RPM drops more than about 2 to 3% from the no load speed. [/QUOTE]
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Torque requirements for launching a soccer ball
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