![]() ![]() Consider a 0.5-kg physics cart loaded with one 0.5-kg brick and moving with a speed of 2.0 m/s. The momentum equation can help us to think about how a change in one of the two variables might affect the momentum of an object. Objects at rest do not have momentum - they do not have any " mass in motion." Both variables - mass and velocity - are important in comparing the momentum of two objects. The momentum of any object that is at rest is 0. Yet if the Mack truck were at rest, then the momentum of the least massive roller skate would be the greatest. The considerably greater mass of the Mack truck gives it a considerably greater momentum. Consider a Mack truck and a roller skate moving down the street at the same speed. Both variables are of equal importance in determining the momentum of an object. The Momentum Equation as a Guide to Thinkingįrom the definition of momentum, it becomes obvious that an object has a large momentum if both its mass and its velocity are large. As a vector quantity, the momentum of an object is fully described by both magnitude and direction. If the bowling ball is moving westward, then its momentum can be fully described by saying that it is 10 kg In a previous unit, it was said that the direction of the velocity vector is the same as the direction that an object is moving. The direction of the momentum vector is the same as the direction of the velocity of the ball.
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