1 / 13

Physics Daily Intro 1/3/18

Physics Daily Intro 1/3/18. Welcome Back!! Some changes to class structure “Board Work” Discussion Days New class website!!. Energy, Work, & Simple Machines. Physics: Chapter 10. Energy & Work 10.1. What is Energy, Work?. What are some things that uses energy or requires work ?

crescent
Download Presentation

Physics Daily Intro 1/3/18

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. Physics Daily Intro 1/3/18 • Welcome Back!! • Some changes to class structure • “Board Work” • Discussion Days • New class website!!

  2. Energy, Work, & Simple Machines Physics: Chapter 10

  3. Energy & Work10.1

  4. What is Energy, Work? • What are some things that uses energy or requires work? • In physics, we need to be specific in how we refer to these ideas

  5. Energy • Energy is a property of an object that describes the object’s ability to change its environment or in itself • Types of energy include chemical, thermal, andmotion

  6. Energy & Motion Some object of mass is moving with a velocity when a force is applied, accelerating the object to a velocity of over a distance

  7. Let’s Do Some Math • A kinematic equation that uses most of the knowns: • Need to find acceleration (we have force and mass) means that • Plug that into the kinematic equation • Do some algebra

  8. Cool, but what does it mean? * This is the energy in the system * Kinetic Energy: * Property of the system, like momentum * This is the work done to the system * Work:

  9. Joules Energy, and by extension work, are both measured using Joules Joule (J) =

  10. Example Problem: Calculating Work • A 105 gram hockey puck is sliding across the ice. A player exerts a constant 4.5 N force over a distance of 0.15 meters. How much work does the player do on the puck? What is the change in the puck’s energy?

  11. Big Points • Kinetic Energy is calculated • It is a property of the system • Work is calculated • It is a property of the environment • Work-Energy Theorem: • Work is equal to the change in kinetic energy • Work and energy are related

  12. Minor Points • Energy is transferred between environment and system • If environment is doing work, +W • If system is doing work, W • Work formula () works only with constant force applied in the direction of motion • If a force is perpendicular to motion, work is 0

  13. Practice Problems: Page 227 • Complete practice problems 1 – 5 on page 227 over calculating work and change in kinetic energy

More Related