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11th grade Energy accounting in open, closed and isolated systems worksheet

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Energy accounting in open, closed and isolated systems

Grade 11 Science Worksheet - Challenge Me

NameDate

Circle the best answer, or write your answer on the line.

  1. A motor does 500 J of work on a cart-and-ramp system. The cart gains 294 J of gravitational and 120 J of kinetic energy. How much thermal energy is made, Ari?

  2. A motor does 800 J of work on a cart-and-ramp system. The cart gains 392 J of gravitational and 250 J of kinetic energy. How much thermal energy is made, Esme?

  3. An electric kettle with no lid takes in 300 kJ. The water gains 250 kJ of thermal energy and 30 kJ leaves with the steam. Where are the other 20 kJ, Jun?

    • Destroyed in the heater
    • Warming the kettle and the room air
    • Stored as gravitational energy in the steam

  4. Why is a kettle with no lid an open system, Kira?

    • Its water stays inside the kettle
    • Steam, which is matter, leaves it
    • No energy can cross its boundary

  5. What change would make a lidless kettle a closed system, Luz?

    • A bigger heater
    • Thick insulation, with the top still open
    • A tight lid, so no steam escapes

  6. Milo says friction destroys energy when a box slides to a stop. Agree or disagree?

    • Disagree: it becomes thermal energy
    • Agree: the box ends with less energy, so energy was lost from the world
    • Agree: the kinetic energy is gone for good

  7. Noah says the total energy of an isolated system stays the same, even with friction inside it. Agree or disagree?

    • Agree: friction moves energy between stores
    • Disagree: isolated systems leak heat
    • Disagree: friction uses energy up

  8. Pia says a closed system's total energy can change. Agree or disagree?

    • Agree: energy can cross its boundary
    • Disagree: closed means nothing crosses
    • Disagree: its matter stays the same, so its energy does too

  9. A spring launcher stores 12 J. The ball it launches leaves with 9 J of kinetic energy. Where did the other 3 J go, Tala?

    • Back into the spring
    • Into the ball's mass
    • Thermal energy and sound in the launcher

  10. A 1 kg cart starts at rest, drops 2 m down a ramp and reaches 6 m/s. With g = 9.8 m/s², how much thermal energy did friction make, Zee?

    • 18 J
    • 37.6 J
    • 19.6 J
    • 1.6 J
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11th grade Energy accounting in open, closed and isolated systems worksheet – printable
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About this worksheet

Energy accounting in open, closed and isolated systems. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can classify systems. In an open system, matter and energy cross. In a closed system, only energy crosses. In an isolated system, nothing does.
  • I can do energy accounting: change inside = energy in − energy out, and work in = the gains in the gravitational, kinetic and thermal stores.
  • I can find the missing energy in a described system, including the thermal energy friction makes.
  • I can explain that the system boundary decides what counts as a store or as outside work. For example, gravity is internal when Earth is in the system. Energy is never destroyed; friction moves it into thermal energy and sound.

Standard: HS-PS3-1

Words to know

system boundary: The line drawn around what you study

open system: Matter and energy cross the boundary

closed system: Energy crosses the boundary; matter does not

isolated system: Neither matter nor energy crosses

energy accounting: Matching energy in and out with the change in stores

Common mistakes

Your child added the energy in and the energy out. The change inside is energy in − energy out.

Your child left out friction. The thermal energy friction makes comes out of the cart's mechanical energy.

Your child left a store out. The work in is shared between gravitational, kinetic and thermal energy.

Questions parents ask

What is the most common mistake with energy accounting in open, closed and isolated systems?

Your child added the energy in and the energy out. The change inside is energy in − energy out.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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