Simple Machines in your world! - PowerPoint PPT Presentation

Loading...

PPT – Simple Machines in your world! PowerPoint presentation | free to download - id: 78a973-MjE1N



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Simple Machines in your world!

Description:

Simple Machines in your world! Imagine eating soup without a spoon hauling dirt without a wheelbarrow opening a door without a doorknob That is what life would ... – PowerPoint PPT presentation

Number of Views:22
Avg rating:3.0/5.0
Slides: 14
Provided by: Cory173
Learn more at: http://feffer.wikispaces.com
Category:
Tags: machines | simple | world

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Simple Machines in your world!


1
Simple Machines in your world!
  • Imagine
  • eating soup without a spoon
  • hauling dirt without a wheelbarrow
  • opening a door without a doorknob
  • That is what life would be like without simple
    machines.

2
Machines are not limited to the complicated
devices such as cars, computers, and airplanes!
  • A machine is any device that makes work easier.
  • They make work easier by placing forces where we
    want them, by moving things faster, and by making
    forces larger.

3
Friction Review
  • Friction is the force we feel when things rub
    against each other
  • The more things are pushed together, the more
    friction there is
  • It is the force that opposes motion.

4
Friction Review
  • Friction slows down the movement of things and
    turns motion into thermal energy (heat).
  • When you rub your hands together you can feel the
    thermal energy produced.
  • The mucus from a slug will decrease friction as
    the slug slides along the ground.

5
Simple Machines
  • The purpose of a simple machine is to
  • A. increase the speed of work
  • B. change direction the force is acting in
  • C. increase Mechanical Advantage
  • - a machines ability to multiply input force

6
Presenting the 6 simple machines1. LEVER2.
INCLINED PLANE3. WEDGE4. SCREW5. WHEEL AND
AXLE6. PULLEY
7
Inclined Plane
  • A simple machine with no moving parts.
  • It increases the distance the object moves, but
    it decreases the amount of force needed to move
    it.
  • It is simply a straight slanted surface.
  • An example - a ramp, roadways, slide, stairs

8
Wedge
  • An inclined plane that moves.
  • Most are made of TWO inclined planes.
  • Examples
  • ax
  • knife
  • and zippers!

9
Screw
  • An inclined plane wrapped around a central bar to
    form a spiral.
  • A screw increases the distance which decreases
    the force needed.
  • Examples
  • Screws
  • Jar lids

10
Lever
  • An arm that pivots (or turns) around a fixed
    point
  • The fixed point is called the fulcrum.
  • A lever increases the distance to decrease the
    force required.
  • Examples
  • seesaw
  • wheelbarrow
  • fishing pole

11
Wheel and Axle
  • A simple machine made up of 2 circular objects of
    different sizes.
  • The wheel is the larger object and turns about
    the small object, (the axle).
  • Because the wheel is larger than the axle, it
    moves a greater distance.
  • Examples
  • roller skates
  • doorknobs

12
Pulley
  • A rope, belt, or chain wrapped around a grooved
    wheel
  • Works in 2 ways
  • changes the direction of the force
  • or
  • changes the amount of force
  • Examples
  • flagpole
  • sails on a sailboat

13
So What??????
  • Like you heard at the beginning, machines make
    work easier. The measure of how much easier is
    called the mechanical advantage.
  • It is important to note that the work that comes
    out of a machine is never greater than the work
    put into a machine. In fact, machines actually
    require more energy to do the same job, even
    though they make the job easier!
  • Most of the machines we use today are compound
    machines - two or more simple machines working
    together!
About PowerShow.com