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06_Linear Momentum and Collisions.ppt
1.
© 2010 Pearson
Education, Inc. Lecture Outline Chapter 6 College Physics, 7th Edition Wilson / Buffa / Lou
2.
Chapter 6 Linear Momentum
and Collisions © 2010 Pearson Education, Inc.
3.
Units of Chapter
6 Linear Momentum Impulse Conservation of Linear Momentum Elastic and Inelastic Collisions Center of Mass Jet Propulsion and Rockets © 2010 Pearson Education, Inc.
4.
6.1 Linear Momentum Definition
of linear momentum: The linear momentum of an object is the product of its mass and velocity. Note that momentum is a vector—it has both a magnitude and a direction. SI unit of momentum: kg • m/s. This unit has no special name. © 2010 Pearson Education, Inc.
5.
6.1 Linear Momentum For
a system of objects, the total momentum is the vector sum of each. © 2010 Pearson Education, Inc.
6.
6.1 Linear Momentum The
change in momentum is the difference between the momentum vectors. © 2010 Pearson Education, Inc.
7.
6.1 Linear Momentum If
an object’s momentum changes, a force must have acted on it. The net force is equal to the rate of change of the momentum. © 2010 Pearson Education, Inc.
8.
6.2 Impulse Impulse is
the change in momentum: Typically, the force varies during the collision. © 2010 Pearson Education, Inc.
9.
6.2 Impulse Actual contact
times may be very short. © 2010 Pearson Education, Inc.
10.
6.2 Impulse When a
moving object stops, its impulse depends only on its change in momentum. This can be accomplished by a large force acting for a short time, or a smaller force acting for a longer time. © 2010 Pearson Education, Inc.
11.
6.2 Impulse We understand
this instinctively—we bend our knees when landing a jump; a “soft” catch (moving hands) is less painful than a “hard” one (fixed hands). This is how airbags work—they slow down collisions considerably—and why cars are built with crumple zones. © 2010 Pearson Education, Inc.
12.
6.3 Conservation of
Linear Momentum If there is no net force acting on a system, its total momentum cannot change. This is the law of conservation of momentum. If there are internal forces, the momenta of individual parts of the system can change, but the overall momentum stays the same. © 2010 Pearson Education, Inc.
13.
6.3 Conservation of
Linear Momentum In this example, there is no external force, but the individual components of the system do change their momenta: © 2010 Pearson Education, Inc.
14.
6.3 Conservation of
Linear Momentum Collisions happen quickly enough that any external forces can be ignored during the collision. Therefore, momentum is conserved during a collision. © 2010 Pearson Education, Inc.
15.
6.4 Elastic and
Inelastic Collisions In an elastic collision, the total kinetic energy is conserved. Total kinetic energy is not conserved in an inelastic collision. © 2010 Pearson Education, Inc.
16.
6.4 Elastic and
Inelastic Collisions A completely inelastic collision is one where the objects stick together afterwards. © 2010 Pearson Education, Inc.
17.
6.4 Elastic and
Inelastic Collisions The fraction of the total kinetic energy that is left after a completely inelastic collision can be shown to be: © 2010 Pearson Education, Inc.
18.
6.4 Elastic and
Inelastic Collisions For an elastic collision, both the kinetic energy and the momentum are conserved: © 2010 Pearson Education, Inc.
19.
6.4 Elastic and
Inelastic Collisions Collisions may take place with the two objects approaching each other, or with one overtaking the other. © 2010 Pearson Education, Inc.
20.
6.5 Center of
Mass Definition of the center of mass: The center of mass is the point at which all of the mass of an object or system may be considered to be concentrated, for the purposes of linear or translational motion only. We can then use Newton’s second law for the motion of the center of mass: © 2010 Pearson Education, Inc.
21.
6.5 Center of
Mass The momentum of the center of mass does not change if there are no external forces on the system. The location of the center of mass can be found: This calculation is straightforward for a system of point particles, but for an extended object calculus is necessary. © 2010 Pearson Education, Inc.
22.
6.5 Center of
Mass The center of mass of a flat object can be found by suspension. © 2010 Pearson Education, Inc.
23.
6.5 Center of
Mass The center of mass may be located outside a solid object. © 2010 Pearson Education, Inc.
24.
6.6 Jet Propulsion
and Rockets If you blow up a balloon and then let it go, it zigzags away from you as the air shoots out. This is an example of jet propulsion. The escaping air exerts a force on the balloon that pushes the balloon in the opposite direction. Jet propulsion is another example of conservation of momentum. © 2010 Pearson Education, Inc.
25.
6.6 Jet Propulsion
and Rockets This same phenomenon explains the recoil of a gun: © 2010 Pearson Education, Inc.
26.
6.6 Jet Propulsion
and Rockets The thrust of a rocket works the same way. © 2010 Pearson Education, Inc.
27.
6.6 Jet Propulsion
and Rockets Jet propulsion can be used to slow a rocket down as well as to speed it up; this involves the use of thrust reversers. This is done by commercial jetliners. © 2010 Pearson Education, Inc.
28.
Summary of Chapter
6 Momentum of a point particle is defined as its mass multiplied by its velocity. The momentum of a system of particles is the vector sum of the momenta of its components. Newton’s second law: © 2010 Pearson Education, Inc.
29.
Summary of Chapter
6 Impulse–momentum theorem: In the absence of external forces, momentum is conserved. Momentum is conserved during a collision. Kinetic energy is also conserved in an elastic collision. © 2010 Pearson Education, Inc.
30.
Summary of Chapter
6 The center of mass of an object is the point where all the mass may be considered to be concentrated. Coordinates of the center of mass: © 2010 Pearson Education, Inc.
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