{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ch06-work-and-kinetic-energy

# ch06-work-and-kinetic-energy - MasteringPhysics 12:30 AM...

This preview shows pages 1–3. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
10/13/08 12:30 AM MasteringPhysics Page 2 of 11 http://session.masteringphysics.com/myct Express your answer in terms of , , and . ANSWER: = The expression that you obtained can be rearranged as The quantity has the same units as work. It is called the kinetic energy of the moving particle and is denoted by . Therefore, we can write and . Note that like momentum, kinetic energy depends on both the mass and the velocity of the moving object. However, the mathematical expressions for momentum and kinetic energy are different. Also, unlike momentum, kinetic energy is a scalar. That is, it does not depend on the sign (therefore direction) of the velocities. Part E Find the net work done on the particle by the external forces during the motion of the particle in terms of the initial and final kinetic energies. Express your answer in terms of and . ANSWER: = This result is called the work-energy theorem. It states that the net work done on a particle equals the change in kinetic energy of that particle. Also notice that if is zero, then the work-energy theorem reduces to . In other words, kinetic energy can be understood as the amount of work that is done to accelerate the particle from rest to its final velocity.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern