Energy Transfers:Pendulum&Bungee Jumper

• What is meant by the conservation of energy?

  Energy can be transferred, stored, or dissipated, but it cannot be created or destroyed.
• What are the forms of energy discussed in the video?

  • Kinetic energy
  • Gravitational potential energy
  • Elastic potential energy
  • Thermal energy
• How can energy be transferred within a system?

  Energy can be transferred from one form to another within a system.
• What happens when energy is dissipated?

  Energy is transferred to less useful forms and is considered wasted.
• What is a closed system in physics?

  • A system where no energy can enter or leave
  • Consists of an object or group of objects
• What is the maximum store of gravitational potential energy in a pendulum?

  The maximum store of gravitational potential energy occurs at the highest point of the swing.
• When does a pendulum have maximum kinetic energy?

  At the bottom of the swing, where it is moving at the fastest speed.
• How does friction affect energy transfer in a pendulum?

  • Friction causes energy to be transferred to thermal energy stores
  • The fixed point and air around the pendulum get warmer
  • This results in energy being dissipated and the pendulum swinging with less energy
• How can unwanted energy transfers in a pendulum be reduced?

  By using lubricants or removing air particles to reduce friction.
• What are the implications of energy dissipation in a pendulum system?

  • Energy is wasted and not available for useful work
  • The pendulum will gradually swing with less energy and eventually stop
• What is meant by the conservation of energy?

  Energy cannot be created or destroyed, only transformed from one form to another.
• How is energy transferred within a system during a bungee jump?

  • Gravitational potential energy is converted to kinetic energy as the jumper falls.
  • Kinetic energy is converted to elastic potential energy when the rope tightens.
  • Elastic potential energy is converted back to kinetic energy during the ascent.
  • Kinetic energy is converted back to gravitational potential energy at the top of the ascent.
• What happens to the energy of a bungee jumper when they reach the maximum height after the jump?

  All energy is in the gravitational potential energy store.
• Why does a bungee jumper not return to their original position after the jump?

  Because energy is dissipated as thermal energy.
• What are the main forms of energy involved in a bungee jump?

  • Gravitational potential energy
  • Kinetic energy
  • Elastic potential energy
  • Thermal energy (due to dissipation)
• How does energy dissipation occur during a bungee jump?

  Through friction with air and stretching of the bungee rope.
• What is the sequence of energy transfers during a bungee jump?

  1. Gravitational potential energy to kinetic energy (falling)
  2. Kinetic energy to elastic potential energy (rope tightens)
  3. Elastic potential energy to kinetic energy (during ascent)
  4. Kinetic energy to gravitational potential energy (at maximum height)