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Level 2 Applied Science Unit 5

Level 2 Applied Science Unit 5. Assignment 2 (P2 M2 D2). Application of Forces. http:// www.youtube.com/watch?v=d7iYZPp2zYY&feature=related. Different Forces. IMPACT FORCES. Different Forces. COMPRESSIVE FORCES. Different Forces. TENSILE FORCES.

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Level 2 Applied Science Unit 5

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  1. Level 2 Applied ScienceUnit 5 Assignment 2 (P2 M2 D2)

  2. Application ofForces http://www.youtube.com/watch?v=d7iYZPp2zYY&feature=related

  3. Different Forces IMPACT FORCES

  4. Different Forces COMPRESSIVE FORCES

  5. Different Forces TENSILE FORCES

  6. Match up the descriptions with the correct names Impact forces Compressive forces Tensile forces When objects are squashed When objects are stretched When objects are squashed or stretched as a result of acceleration

  7. Seatbelts What makes a good seatbelt? Why are seatbelts important?

  8. What do the fibres inside seatbelts look like? Label Label Label

  9. Your practical for unit 5 P2 • Hanging a stretchy object like a spring or rubber band next to a metre rule • Placing different masses onto the spring • Measuring the extension of the spring You can test this in different spring set ups. SINGLE SERIES PARALLEL

  10. Original length of rubber band Relaxed rubber band Original rubber band

  11. Load calculations Load is a force and it is the weight

  12. Extension of a rubber band • A rubber band can be stretched by adding mass to it • This means that the rubber band has been extended from it’s original length Original length of a rubber band was 5cm

  13. Load calculations Complete worksheet after you’ve practised these calculations

  14. For the merit: You will need to draw graphs and interpret your graphs LOAD (N) Extension (cm)

  15. Hooke’s law is true up until a certain point… The spring does not pull back into shape, it has been deformed The spring pulls back into its original shape

  16. Interpreting your graphs • As the force/ load increases, the extension of the rubber band increases • Hooke’s law states that: The amount that a spring stretches is proportional to how much force is applied to it. So if you double the mass on a spring – you double its extension. You will need to state if your graphs from practical agrees or disagrees with Hooke’s law

  17. When the graph is more steep and has a large gradient: When the graph is less steep and has a small gradient: High spring constant: Requires more force in order to stretch. Low spring constant: Stretches further with smaller amount of force. Gradient represents the spring constant

  18. What type of spring constants should seatbelts have?

  19. Why not have seat belts with low spring constants (not stiff/very stretchy)? The material will be too elastic. It will not stop stretching at a safe limit. It will reach its elastic limit sooner

  20. Why not have seat belts with high spring constants (very stiff/not stretchy)? The material would slow your body down too quickly. This can be dangerous and can result in injuries.

  21. Extra notes

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