I happen when two meet with force, Sometimes straight, sometimes off course. I can be loud, I can be small, But after I come, objects may fall. What am I?, Friction, Gravity, Collision, Magnetism, I make sure nothing is lost or gone, What you have before stays the same all along. What am I?, Conservation, Speed, Conservational, Force, I keep you moving once you start, The faster you go, the stronger my part. I depend on your mass and speed too. What am I?, Motion, Impulse, Momentum, Force

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