pulleys

• Pulley systems are used to transmit motion and force, change the direction of force, and lift or lower loads
• • Fixed Pulleys
  • Movable Pulleys
  • Compound fixed and moveable Pulleys
  • Block and Tackle pulley

  types of pulleys
• • Using pulley system there is a mechanical advantage
  • This is determined by dividing the load by the effort
  • The greater the mechanical advantage, the further you have to pull the rope to lift the weight
  • The more pulleys, the greater the mechanical advantage
• Work done is the relationship between the effort (force) used to move an object and the distance that the object is moved. 
• • W = Fd 
  • W = Work done (J) 
  • F = Force (N) 
  • d = Distance (m) 


  How to calculate work done
• The symbol for work is W and the unit is the Joule (J) 
• Power(W)=energy(J)/time(S)


  How to calculate power
• Efficiency(n)=energy output/energy input x 100%


  How to calculate efficiency
• F=ma

  • F=force(N)
  • m=mass(kg)
  • a=acceleration(m/s²)


  How to calculate force
• F=mg

  • F=force(N)
  • m=mass(kg)

  • g=acceleration due to gravity(m/s²)


  How to calculate weight