bell ringer 1 27 10 l.
Download
Skip this Video
Download Presentation
Bell Ringer 1-27-10

Loading in 2 Seconds...

play fullscreen
1 / 13

Bell Ringer 1-27-10 - PowerPoint PPT Presentation


  • 76 Views
  • Uploaded on

Bell Ringer 1-27-10. See if you can answer these from memory: What is a force? What unit measures force? A ________ is a combination of all the forces acting on an object. List the two types of forces and the key words we use to remember them. Chapter 10 section 2 friction and Gravity.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Bell Ringer 1-27-10' - ros


Download Now 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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
bell ringer 1 27 10

Bell Ringer 1-27-10

See if you can answer these from memory:

What is a force?

What unit measures force?

A ________ is a combination of all the forces acting on an object.

List the two types of forces and the key words we use to remember them.

friction foldable
Friction Foldable
  • Once your paper is folded, label the four sections with the four types of friction:
      • Static friction
      • Sliding friction
      • Fluid friction
      • Rolling friction

p. 342

types of friction
Types of friction
  • Static friction – friction that acts on objects that are not moving Ex. Pushing on a heavy refrigerator/ driving off with a book on top of the car
  • Sliding friction – friction that occurs when 2 solid surfaces slide over each other Ex. Bike brakes/ ballet dancers
types of friction cont d
Types of Friction (cont’d)
  • Rolling friction- occurs when an object rolls across a surface (ex: skateboard on road)
  • Fluid friction – occurs when a solid object moves through a fluid (ex: surfboard on water)
who is this
Who is this?

Sir Issac Newton

gravity
Gravity
  • Gravity- a force that pulls objects toward each other
    • Ex: Earth pulling us toward it
  • Law of Universal Gravitation- the law that states that the force of gravity acts between all objects in the universe
  • Why don’t you feel the gravity between other objects and you?
gravity8
Gravity
  • Two factors affect Gravity:
    • 1. Mass
      • amount of matter in an object
      • Not affected by gravity
      • Greater the mass, greater the gravity
      • Ex: sun and planets
    • 2. Distance
      • Increase distance, decrease gravity
weight
Weight
  • Weight- the force of gravity on an object or person
air resistance
Air Resistance
  • Air Resistance- an upward force exerted on falling objects
  • It’s not the same for all objects.
  • The greater the surface area, the greater the air resistance.
terminal velocity
Terminal Velocity
  • Terminal Velocity- the greatest velocity a falling object reaches
    • Exists when the force of air resistance equals the weight of the object/or the force of gravity pulling down on the object
    • Air Resistance = Weight or Gravity
projectile
Projectile
  • Projectile- an object that is thrown
  • Will an object that is thrown horizontally land on the ground at the same time as an object that is dropped?
exit quiz 1 26 10
Exit Quiz 1-26-10
  • What is a force?
  • The combination of all the forces acting on an object is called ______.
  • If two forces are balanced, is there a net force?
  • The SI unit for force is the ________.
  • Tell me one of the four types of friction and give an example.
ad