pendulum

• What does the conservation of energy mean?

  Energy cannot be created or destroyed
• How can energy be transferred within a system?

  It can be transferred, stored, or dissipated
• What happens when energy is dissipated?

  It is wasted and less useful
• What is kinetic energy?

  Energy stored in a moving object
• What is gravitational potential energy?

  Energy stored due to an object's height
• What is elastic potential energy?

  Energy stored in a stretched spring
• What is thermal energy?

  Energy stored due to an object's temperature
• What is a system in physics?

  An object or group of objects
• What is a closed system?

  No energy can enter or leave
• What happens to energy in a pendulum at the top of the swing?

  It has maximum gravitational potential energy
• What happens to energy in a pendulum at the bottom of the swing?

  It has maximum kinetic energy
• How does kinetic energy transfer back to gravitational potential energy in a pendulum?

  As the mass swings back up
• What role does friction play in the pendulum model?

  It causes energy to be transferred to thermal energy
• What happens to the fixed point and air around the pendulum due to friction?

  They gradually get warmer
• What is meant by energy being dissipated?

  Energy is wasted and less useful
• What can be done to reduce unwanted energy transfers in a pendulum?

  Reduce friction using lubricants
• How can air particles be removed from around the pendulum?

  By creating a vacuum
• What are the key concepts related to energy in this video?

  • Conservation of energy
  • Energy transfer within a system
  • Energy dissipation
  • Forms of energy: kinetic, gravitational potential, elastic potential, thermal
• What are the energy transfers in a pendulum system?

  1. Maximum gravitational potential energy at the top
  2. Transfer to kinetic energy at the bottom
  3. Kinetic energy transfers back to gravitational potential energy as it swings up
  4. Friction causes energy to dissipate as thermal energy