Chapter 7 Momentum and Impulse96Chapter 7IMPULSE AND MOMENTUMPREVIEWThemomentumof an object is the product of its mass and velocity. If you want to changethe momentum of an object, you must apply animpulse, which is the product of force andthe time during which the force acts. If there are no external forces acting on a system ofobjects, the momentum is said to be conserved, that is, the total momentum of the systembefore some event (like a collision) is equal to the total momentum after that event. Inthis chapter, we will discuss examples of both one- and two-dimensional collisions.The content contained in all sections of chapter 7 of the textbook is included on the APPhysics B exam.QUICK REFERENCEImportant TermsimpulseThe product of the average force acting on an object and the time during which itacts. Impulse is a vector quantity, and can also be calculated by finding the areaunder a force versus time curve.linear momentumThe product of the mass of an object and its velocity. Momentum is a vectorquantity, and thus the total linear momentum of a system of objects is the vectorsum of the individual momenta of the objects in the system.internal forcesThe forces which act between the objects of a systemexternal forcesThe forces which act on the objects of a system from outside the system, that is byan agent which is not a part of the system of objects which are being studied.inelastic collisionA collision between two or more objects in which momentum is conserved butkinetic energy is not conserved, such as two railroad cars which collide and locktogether.elastic collisionA collision between two or more objects in which both momentum and kineticenergy are conserved, such as in the collision between two steel balls.center of massThe point at which the total mass of a system of masses can be considered to beconcentrated.
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