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Two balls, each with a mass of 0.5 kg, collide on a pool table. Is the law of conservation of momentum satisfied in this collision? Explain why or why not.

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Conservation of momentum is a fundamental law of physics. This law states that the momentum of a system is constant if there are no external forces acting on the system. In a situation in which two balls, each with a mass of 0.5 kg, collide on a pool table the law of conservation of momentum is not satisfied because there are external forces that moved the balls. 
Yes, the law of conservation of momentum is satisfied. The total momentum before the collision is 1.5 kg • m/s, and the total momentum after the collision is 
1.5 kg • m/s. The momentum stays the same after the collision.

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