1 / 9

Announcements

Announcements. Homework for tomorrow… (Ch. 7, Probs. 3, 5, & 6) Office hours… M 3-4 pm TWR 9-10 am F 1-2 pm Tutorial Learning Center – Houston Hall 113 MWR 8 am-6 pm T 8 am-7 pm F 8 am-5 pm. Chapter 7. Translational Momentum

hashim
Download Presentation

Announcements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Announcements • Homework for tomorrow… (Ch. 7, Probs. 3, 5, & 6) • Office hours… M 3-4 pm TWR 9-10 am F 1-2 pm • Tutorial Learning Center – Houston Hall 113 MWR 8 am-6 pm T 8 am-7 pm F 8 am-5 pm

  2. Chapter 7 Translational Momentum (Momentum and Impulse)

  3. Section 7.2:Translational Momentum of a Particle Translational Momentum • Vector quantity - direction is that of the velocity of the object • Constant momentum  straight-line motion • Units?

  4. Quiz Question 1 A ball hits a wall and rebounds with the same speed, as diagrammed below. The changes in the components of the momentum of the ball are: • px> o, py> o • px< o, py> o • px= o, py> o • px= o, py< o • px> o, py< o y   x

  5. Newton’s 2nd Law, reformulated Newton’s 2nd Law… Newton’s 2nd Law, reformulated… Both forms are equal for constant mass only

  6. Newton’s 2nd Law • Newton’s 2nd Law.. • Newton’s 2nd Law, averaged..

  7. Reading Exercise 7.2 The figure gives the x-component of translational momentum versus time for a particle moving along an x-axis. A force directed along the axis acts on the particle, causing its momentum to change. • Rank the four regions indicated according to the magnitude of the force, greatest first. • In which region is the particle slowing down?

  8. Example Problem The front 1.20 m of a 1400-kg car is designed as a “crumple zone” that collapses to absorb the shock of a collision. If a car traveling 25.0 m/s stops uniformly in 1.20 m, • how long does the collision last, • what is the magnitude of the average force on the car, and • what is the acceleration of the car? Express the acceleration as a multiple of the acceleration of gravity.

  9. Section 7.3:Isolated System of Particles Translational momentum of a systemis the vector sum of the momenta of the individual particles For a system of particles… where is vector sum of all externalforces acting on the system

More Related