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OCR: Click on "NEXT PAGE' below to learn more about the following: - Velocity - Rebounding - Conservation of momentum - Friction and Other Properties - Angular collisions - World Book articles with more information VELOCITY In this experiment, when a car's momentum increases or decreases after the collision, the car's mass remains the same but its velocity changes. For example, if momentum increases, the velocity of the car increases. REBOUNDING The cars do not always rebound after a collision. Sometimes one car continues in the same direction but with less speed. This occurs because the momentum of the car that continues in the same direction is much greater than that of the other car. CONSERVATION OF MOMENTUM This experiment illustrates an important law of physics known as the conservation of momentum, which states that momentum is always conserved when two bodies act on each other without outside forces. FRICTION AND OTHER PROPERTIES Friction and other properties related to energy also affect momentum as the cars move. To simplify this experiment, these properties are not included as contributing factors in the equations. ANGULAR COLLISIONS If two bumper cars collide at an angle rather than head-on, the cars can rotate or spin. For simplicity, this simulation does not show collisions at any angle. RELATED ARTICLES You can learn more about momentum in the following articles: Momentum Force Mass Motion Velocity