Chapter 8 Notes - PowerPoint PPT Presentation

1 / 14
About This Presentation
Title:

Chapter 8 Notes

Description:

Speed: distance traveled divided by the time interval during which ... Earth to GEO (geosynchronous Earth orbit) 25,700 mph. Earth to lunar orbit. 24,200 mph ... – PowerPoint PPT presentation

Number of Views:70
Avg rating:3.0/5.0
Slides: 15
Provided by: wlem6
Category:

less

Transcript and Presenter's Notes

Title: Chapter 8 Notes


1
Chapter 8 Notes
  • Motion and Forces

2
Chapter 8.1 Notes
  • Speed distance traveled divided by the time
    interval during which the motion occurred
  • SpeedDistance/time
  • Constant speed speed does not change

3
  • Velocity is a quantity describing both speed and
    direction (same number as speed but with a
    direction added)
  • Momentum a quantity defined as the product of an
    objects mass and its velocity
  • Momentum Mass x Velocity

4
Chapter 8.2 Notes
  • Acceleration change in velocity, if the object
    speeds up, slows down, changes direction.
  • Acceleration

Final velocity - initial velocity
time
5
  • Force the cause of acceleration, or change in an
    objects velocity.
  • Balanced forces are forces acting on an object
    that combine to produce a net force equal to
    ZERO.
  • Unbalanced forces are forces acting on an object
    that combine to produce a net nonzero force.

6
  • Friction the force between two objects that
    opposes the motion of either object. So whenever
    two objects touch there is friction.
  • Air resistance is a type of friction.
  • Low friction shoes on ICE
  • High friction shoes on pavement

7
  • Gravity- the attraction between two particles of
    matter due to their mass.
  • The larger the mass the larger the gravitational
    pull.
  • The closer together the two objects are the
    greater the gravitational pull.

8
Chapter 8.3 Notes
  • Newtons 3 Laws of Motion
  • An object at rest remains at rest and an object
    in motion maintains its velocity unless it
    experiences an unbalanced force.
  • The unbalanced force action on an object equals
    the objects mass times its acceleration. Force
    (m)(a)
  • For every action force, there is an equal and
    opposite reaction force.

9
Newtons 1st law
  • Inertia the tendency of an object to remain at
    rest or in motion with a constant velocity.
  • That is why we wear seatbelts, put babies in car
    seats, need to sit away from airbags.
  • New York State passed the first seat belt law in
    the US in 1984 under the leadership of John D.
    States, an orthopedic surgeon who dedicated his
    career to improving automotive safety.

10
  • Remember, it is not just the law, but a way to
    help prevent accidental injury or death when your
    children are riding in a vehicle.  These laws are
    the minimum requirements.  Children are safer
    riding in booster seats through  80 pounds than
    using the vehicle's seats and restraint systems
    designed for adults.       Many states are
    seeking to change their laws to require children
    stay in restraints through 8 years and 80
    pounds. 

11
Newtons 2nd law
  • Free fall is when the force of gravity is the
    only force action on an object.
  • Gravity (g) 9.8 m/s2
  • Weight mass times gravity
  • Terminal velocity is the maximum velocity reached
    by a falling object.

12
  • Weight is the pull of gravity on an
    objectchanges from place to place.
  • Mass is the amount of matter in an objectNEVER
    changes.

13
How Fast do Rockets Go??
Rockets deal with Newtons 3rd law of motion
14
Work Cited
  • Sonic Boom Plane. April 7, 2008.
    http//www.aviationexplorer.com/sonicboomplane_nav
    y.jpg
  • US map of car seat law and info. April 9, 2008.
    http//www.inventiveparent.com/state-laws.htm
  • Seat belt laws. April 9, 2008.
    http//en.wikipedia.org/wiki/Seat_belt_legislation
  • rocket info. April 9, 2008. http//www.qrg.north
    western.edu/projects/vss/docs/Propulsion/2-how-fas
    t-conventional.html
Write a Comment
User Comments (0)
About PowerShow.com