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Force and Pressure

Force and Pressure. 1. What are Forces?. A push or pull. Examples of Forces . Squeezing Stretching Twisting Folding. Effects of Forces. Object’s shape changes Object’s size changes Stationary object moves. Effects of Forces. Moving object stops

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Force and Pressure

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  1. Force and Pressure 1

  2. What are Forces? • A push or pull

  3. Examples of Forces • Squeezing • Stretching • Twisting • Folding

  4. Effects of Forces • Object’s shape changes • Object’s size changes • Stationary object moves

  5. Effects of Forces • Moving object stops • Moving object speeds up or slows down • Direction of an object’s motion changes

  6. Weighing scale

  7. Tsunami

  8. Weight lifting

  9. Ultimate frisbee

  10. Naruto vs Sasuke

  11. Measuring Forces • S.I unit of force is newton (N) • Spring balance used to measure the amount of force applied

  12. Types of Spring Balance • Extension spring balance • Spring stretches when a pulling force acts on it • Greater force, greater extension • Spring attached to a pointer which indicates the amount of force exerted on the spring

  13. Types of Spring Balance • Compression spring balance • Spring compressed when a pushing force acts on it • Greater force, greater compression • Spring attached to a pointer which indicates the amount of force exerted on the spring

  14. Forces Around Us • Gravity • Friction • Magnetism

  15. Gravity • Gravity is the force that attracts objects to the Earth • Mass is a measure of the amount of matter in a body • Weight is a measure of the gravitational force exerted on the object

  16. Friction • Frictional force acts when one materials rubs against another • Friction is useful in walking and when applying brakes to stop a car • Constant friction leads to wear and tear • Friction produces heat

  17. Magnetism • Magnetism is the force exerted by a magnet on magnetic materials such as iron and steel • Every magnet has a North pole and a South pole • Like poles repel • Unlike poles attract

  18. What is Pressure? • Amount of force acting on a unit area • A sharp object pierces a surface more easily than a blunt object

  19. Calculating Pressure Pressure = Force Area

  20. Applications of Pressure in Everyday Life • Bulldozer • Can openers • Knife • Plane • Suction cups

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