LEARNING OBJECTIVES By the end of this section, you will be able to: Momentum is an important quantity because it is conserved. Yet it was not conserved in the examples in Impulse and Linear Momentum and Force, where large changes in momentum were…
LEARNING OBJECTIVES By the end of this section, you will be able to: The effect of a force on an object depends on how long it acts, as well as how great the force is. In Example 8.1, a very large…
LEARNING OBJECTIVES By the end of this section, you will be able to: Linear Momentum The scientific definition of linear momentum is consistent with most people’s intuitive understanding of momentum: a large, fast-moving object has greater momentum than a smaller,…
Figure 8.1 Each rugby player has great momentum, which will affect the outcome of their collisions with each other and the ground. (credit: ozzzie, Flickr) Chapter Outline 8.1 Linear Momentum and Force 8.2 Impulse 8.3 Conservation of Momentum 8.4 Elastic Collisions in One Dimension 8.5 Inelastic Collisions…
Work: The Scientific Definition Kinetic Energy and the Work-Energy Theorem Gravitational Potential Energy Conservative Forces and Potential Energy orKE+PE=constant KEi+PEi=KEf+PEf⎫⎭⎬⎪⎪(conservative forces only),KE+PE=constant orKEi+PEi=KEf+PEf(conservative forces only), where i and f denote initial and final values. This is known as the conservation of mechanical energy. Nonconservative Forces Conservation…
LEARNING OBJECTIVES By the end of this section, you will be able to: Energy is an important ingredient in all phases of society. We live in a very interdependent world, and access to adequate and reliable energy resources is crucial…
LEARNING OBJECTIVES By the end of this section, you will be able to: Energy Conversion in Humans Our own bodies, like all living organisms, are energy conversion machines. Conservation of energy implies that the chemical energy stored in food is…
LEARNING OBJECTIVES By the end of this section, you will be able to: What is Power? Power—the word conjures up many images: a professional football player muscling aside his opponent, a dragster roaring away from the starting line, a volcano…
LEARNING OBJECTIVES By the end of this section, you will be able to: Law of Conservation of Energy Energy, as we have noted, is conserved, making it one of the most important physical quantities in nature. The law of conservation of…
LEARNING OBJECTIVES By the end of this section, you will be able to: Nonconservative Forces and Friction Forces are either conservative or nonconservative. Conservative forces were discussed in Conservative Forces and Potential Energy. A nonconservative force is one for which work depends on…