Work

• Work done (from Physics point of view)

  When an applied force is able to move an object in the direction of the force through a certain distance
• Energy


  A scalar quantity that only has magnitude but no direction
• Unit of Energy


  Joule (J)
• Kinetic Energy


  The energy of moving objects, all objects with mass and motion have kinetic energy
• Potential Energy


  Stored energy, different types include elastic, chemical, and gravitational
• Gravitational Potential Energy


  Energy stored in an object due to its position in a gravity field, depends on mass, gravity field strength, and vertical height
• When energy is transferred from one body to another, the form of energy may change but the total amount of energy is conserved
• Work is only done if there is a transfer of energy, and the energy of the body doing the work decreases while the energy of the body receiving the work increases
• Conditions for work to be done

  1. Force applied, 2) Distance moved, 3) Distance moved in the direction of the force
• Work is not done if: 1) No force applied, 2) Force applied but no distance moved, 3) Force and distance moved are perpendicular to each other
• Conservation of Mechanical Energy

  The total of kinetic and potential energy remains the same, but their individual amounts can change, as long as there are no frictional forces
• Formula of gravitational potential energy 


  Ep = mgh
• Formula of kinetic energy


  Ek = 1/2mv^2
• The amount of energy transferred from one body to another is equal to the work done. This means that work is only done if there is a transfer of energy.
• To transfer the energy work is done. To do work, a force needs to be applied, this applied force must move the object in the direction of the applied force.
• Formula for work


  w = Fd
• Total Energy means the sum of all forms of energy present in a given situation.
• Formula for Total Energy 


  Et = Ep+Ek