𝐹𝑜𝑟𝑐𝑒𝑠 ꨄ

• Types of forces


  • Contact
  • Non-contact
• Contact forces


  • Air resistance
  • Gravity
  • Water resistance
  • Friction
  • Upthrust
• Non-contact forces


  • Static electricity
  • Magnetism
• Force


  A push or pull
• Forces


  • Can change the shape, speed or direction of an object
• Unit for measuring force

  Newtons [N]
• Weight


  The force of gravity pulling on you
• Mass


  The amount of matter that makes up an object
• Hooke's Law


  When you apply force to a material it can extend, and the extension is proportional to the force applied
• Deformation occurs when a force has been applied to an object to change its shape
• The greater the force applied, the more deformed the spring will be
• SI units


  • Length (metres, m)
  • Area (metres², m²)
  • Volume (metres³, m³)
  • Mass (kilograms, kg)
  • Time (seconds, s)
  • Force (newtons, N)
  • Pressure (newtons per metre squared, N/m² or pascals, Pa)
  • Energy (joules, J)
  • Speed (metres per second, m/s)
• Friction


  The force between two touching objects that can slow things down or make them stay still
• Friction


  • Can be decreased by making surfaces smoother or adding lubricants
  • Can be increased by using certain materials such as rubber
• Pressure


  The amount of force pushing on a certain area, measured in newtons per metre squared (N/m²) or pascals (Pa)
• If you keep the size of the force the same

  For a larger area the pressure will be the same, for a smaller area the pressure will be higher
• If you keep the area the same

  For a larger force the pressure will be higher, for a smaller force the pressure will be lower
• Balanced forces


  Forces acting in the opposite direction that are the same size
• Unbalanced forces


  Forces acting in the opposite direction that are different sizes
• Resultant force


  The force left over after both forces have been cancelled out, calculated by subtracting all the forces from each other