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object collision
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friction on surfaces: Use this for this purpose. Based on normal force and friction coefficient -> but to get normal force I have to either calculate it via f=ma or directly in "acceleration calculation" -> maybe change this to summing up the force on an object and do acceleration afterwards ?
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change to verlet integration ( https://pikuma.com/blog/verlet-integration-2d-cloth-physics-simulation )
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add factory for cloth
