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