| 1 | So what is friction exactly? | |
| 2 | We know in life that friction takes kinetic energy out. | |
| 3 | If there is no friction, if there are no other forces, only gravity. | |
| 4 | The advantage of rolling bearing is that they cause less friction. | |
| 5 | But momentum is conserved, because those frictional forces are all internal. |
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