1 / 15

PHYSICS

PHYSICS. Forces Work, Energy, Power. Definition. Physics is the study of matter and its motion through space in time One of the o ldest academic disciplines Physics has close relations with chemistry, math, and biology. Forces. A force is a push or pull in a particular direction

breck
Download Presentation

PHYSICS

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 Forces Work, Energy, Power

  2. Definition • Physics is the study of matter and its motion through space in time • One of the oldest academic disciplines • Physics has close relations with chemistry, math, and biology

  3. Forces • A force is a push or pull in a particular direction • Forces affect how objects move • They can make objects: • Start moving • Move faster • Move slower • Stop moving • Change direction • Change Shape

  4. Forces • Measured in Newtons (N) • Kg/m/s2 • F=ma • Usually act in pairs • Act in a direction • Forces can usually not be seen, but their effects tend to be more obvious

  5. Forces • Balanced • No change in motion • Unbalanced • Change in motion

  6. EnergyWorkPower

  7. Work • Work is a force acting over a distance to move an object • Force x Distance • Joule (J)

  8. Is it work? • A teacher applies force to a wall and becomes exhausted • A book falls of a table and free falls to the ground • A waiter carries a tray above his head across a room at constant speed • A rocket accelerates through space

  9. What about deceleration? • Negative Work • When a force acts against a moving object to hinder displacement • Displacement? • Example: When a car skids to a stop at a red light, the brakes are exerting a force on the tires to cause them to travel a shorter distance

  10. Energy • Energy is the ability to do work • Potential • Kinetic • Power x Time • Joule (J)

  11. Potential Energy • Stored energy possessed by an object • 2 kinds • Gravitational • Wrecking Ball • Elastic • Bow • Gravitational PE • Mass x g x height

  12. Kinetic Energy • Energy of motion • Many forms • Vibrational • Rotational • Translational • Energy due to motion from one location to another • KE = ½ x Mass x Velocity2 • If velocity increases, KE increases V2

  13. Power • Power is the rate at which work is done • Work / Time • Force x Velocity • Watt = J/s • 1 horsepower = 750 Watts

  14. Power • Let’s talk football • Lineman • Force is greater with grater mass • Also needs high velocity capabilities

  15. What is a Power Rating? • Most machines have a power rating, but where does the rating come from? • Indicates the rate at which a machine can do work to other objects • Power rating on cars describe how fast the car can accelerate • More powerful engines can do an equal amount of work in less time

More Related