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Force
 

Force

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    Force Force Presentation Transcript

    • Force, Motion, Energy, Matter
    • Magnets
      Magnets have an effect on some materials.
      Magnets can make things move.
      Magnets can push/pull or attract/repel things with containing iron.
      Vocabulary: attraction-nonattraction
      metal – nonmetal
      magnetic - nonmagnetic
      north and south poles
      opposites
    • Magnets have useful applications.
      We use magnets to hang pictures on our refrigerators.
      Magnetized screwdrivers help hold the screw in place.
      A compass has a magnetized needle pointing north.
      Magnets hold the lids from cans when using a can opener.
    • The Six Simple Machines
      Work, in physics, is a result of a force moving an object through a distance against a resistance. Work is always done by some agent, such as a person or a machine. This agent produces the force that causes the movement.
    • Another Definition
      Force is a push or a pull. In your everyday life, you experience a variety of forces. You apply a force to a ball when you throw it up in the air. As the ball rises, the force of gravity slows it down. As the ball descends, gravity makes it fall more rapidly. When you catch the ball, it applies a downward force to your hands. But your hands apply an upward force to the ball to stop it.
    • Six Simple Machines
      The six simple machines help us do work..
      The six simple machines help to add force to help move something.
      The six simple machines are:
      lever, screw, pulley, wheel and axle, inclined plane, and wedge
    • The Lever
      Lever, is one of the six simple machines for performing work. It consists of a rod or bar that rests and turns on a support called a fulcrum. A force of effort is applied at one end of the rod to lift a load placed at the other end. A lever can help lift a weight with less effort. Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.
    • Three Classes of Levers
      First-class levers – the fulcrum is in the middle like a seesaw,crowbar, or balance scale.
      Second-class levers- the load is in the middle like a wheel barrow, or a nutcracker.
      Third-class levers – the effort is in the middle like a broom or a rake.
    • First-class Lever
      Effort
      Load
      Fulcrum
    • Screw
      Screw is an inclined plane wrapped in a spiral around a shaft. The screw is one of the six simple machines developed in ancient times.
    • Wedge
      Wedge is a device that has two or more sloping surfaces that taper either to a sharp edge or to a point. Wedges are used to split or pierce materials, and to adjust the positions of heavy objects. Knives, chisels, axes, pins, needles, and nails are wedges.
    • Inclined Plane
      Inclined planeis a device used to raise heavy loads with relatively small forces. For example, pushing a load up a ramp onto a platform requires less force than lifting the load onto the platform.
      Ramps and steps are forms of inclined planes.
    • Wheel and Axle
      Wheel and axle is a mechanical device used in lifting loads. It is one of the six simple machines developed in ancient times and ranks as one of the most important inventions in history. Sometimes teeth or cogs may be placed around the edge of the wheel, as in a cogwheel, or on the sprocket wheel of a bicycle.
    • Pulleys
      Pulley is a wheel over which a rope or belt is passed for the purpose of transmitting energy and doing work.
    • Different Kinds of Motion
      Objects may have straight, circular, or back and forth motions or movements.
      Objects vibrate like the strings on a guitar.
      Pushes or pulls can change the movement of an object.
      You can see movement or motion anywhere.
    • Matter, the substance of which all objects are made.
      Matter can either be a solid, liquid, or gas.
      Matter has mass and volume.
      Objects are made of smaller parts
      These parts are too small to be seen without magnification.
      Physical properties remain the same as the material is reduced in size.
    • Physical Properties of Matter
      Form – flexible,stiff, straight, curved
      Color – eight basic colors
      Shape –circle, triangle, square
      Texture – rough, smooth, hard, soft,
      Size and weight –big, little, heavy, thin, etc
      Position – over, under, in, out
      Speed – fast, slow
    • Water, Water, Water
      Water occurs in three different forms.
      Solid – ice, snow, hail, frost
      Liquid- drinking water
      Gas- steam,
      The natural flow of water is down hill.
      Some materials float, while others sink.
      Some liquids will mix with water, like vinegar.
      Some liquids will not mix with water, like oil.
    • More about Water
      Some solids will dissolve in water like baking soda, powdered drink mix, sugar, and salt.
      Some solids will not dissolve in water like sand, soil, and rocks.
      Some solids will dissolve easily in hot water rather than cold water.
    • Changing from one state of matter to another state.
      Condensation Gas to liquid
      Evaporation Liquid to Gas
      Melting Solid to liquid
      Freezing Liquid to Solid
      A change in temperature will cause these changes
    • Solids will expand when heat is added.
      Solids will contract when heat is taken away (cooled).