8.3 Conservation of Energy

Cards (23)

  • Energy can be created or destroyed according to the conservation of energy principle.
    False
  • Understanding conservation of energy is crucial for analyzing physical processes.

    True
  • What is the conservation of energy principle in physics?
    Total energy remains constant
  • What type of energy is stored in a raised object?
    Potential
  • When an object falls, its potential energy is transformed into kinetic energy.
  • Order the following examples of energy conservation based on the original energy form:
    1️⃣ Falling Object (Gravitational Potential → Kinetic)
    2️⃣ Burning Fuel (Chemical → Thermal)
    3️⃣ Light Bulb (Electrical → Light)
    4️⃣ Power Plant (Thermal → Electrical)
  • When an object is lifted, its kinetic energy is transformed into gravitational potential energy.
  • Energy cannot be created or destroyed, but it can be transformed from one form
  • The law of conservation of energy states that energy cannot be created or destroyed
  • Steps for applying the law of conservation of energy to problem-solving:
    1️⃣ Identify energy types
    2️⃣ Write the equation E<sub>initial</sub> = E<sub>final</sub>
    3️⃣ Substitute values
    4️⃣ Solve for unknowns
    5️⃣ Check units
  • Moving objects are an example of kinetic energy.
  • What does the law of conservation of energy state?
    Energy cannot be created or destroyed
  • Match the original energy form with its transformed form:
    Potential ↔️ Kinetic
    Chemical ↔️ Thermal
    Electrical ↔️ Light
    Thermal ↔️ Electrical
  • What causes a light bulb to emit light?
    Electricity heats the filament
  • What type of energy is released when fuel is burned?
    Thermal energy
  • Match the type of energy with its example or transformation:
    Kinetic Energy ↔️ Moving objects
    Potential Energy ↔️ Stored energy
    Thermal Energy ↔️ Heat
    Electrical Energy ↔️ Electric circuits
  • When an object falls, its gravitational potential energy is converted into kinetic
  • What type of energy is produced by a light bulb?
    Light
  • In a falling object, gravitational potential energy is converted into kinetic energy.

    True
  • What happens to gravitational potential energy as a ball falls?
    It is converted into kinetic energy
  • The total energy in a closed system remains constant according to the law of conservation of energy.

    True
  • Energy transformations always increase the total amount of energy in a system.
    False
  • The kinetic energy of a 2 kg ball dropped from 5 meters is 98 joules just before it hits the ground.
    True