Two billiard balls, having collided, scattered in different directions. What forces for the system, including these balls
| February 11, 2021 | education
Two billiard balls, having collided, scattered in different directions. What forces for the system, including these balls, are internal and what are external? Is this system of bodies closed?
It appears if there is no frictional force.
Internal: the power of action and reaction
External: gravity, support reaction force
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