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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

NameDate

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

  1. A 2 kg cart rolls from rest down a 3 m high ramp; friction makes 18.8 J of thermal energy. With g = 9.8 m/s², what is its final kinetic energy, Ari?

  2. A 1 kg cart rolls from rest down a 5 m high ramp; friction makes 14 J of thermal energy. With g = 9.8 m/s², what is its final kinetic energy, Bo?

  3. A 0.5 kg cart rolls from rest down a 4 m high ramp; friction makes 4.6 J of thermal energy. With g = 9.8 m/s², what is its final kinetic energy, Esme?

  4. A drone lifts a box. If the system is the box and Earth, how is the gain in gravitational energy counted, Jun?

    • As a store inside the system
    • As work done by gravity from outside
    • It isn't counted

  5. A cart slides to a stop on a floor. For which system is the total energy unchanged, Luz?

    • The floor alone
    • The cart, the floor and the air together
    • The cart alone

  6. Read this first

    Use this

    Energy bar chart (example data), one bar per energy store, height in J. Before: chemical 500 J. After: chemical 450 J. A dashed system boundary surrounds a battery and a fan motor. Two arrows cross it outward: moving air 30 J and heat to the room 20 J.

  7. In the energy bar chart, how much does the battery's chemical store fall, Noah?

    • 50 J, matching the energy that leaves
    • 30 J, just the moving air
    • 450 J

  8. In the energy bar chart, what kind of system is the battery and motor, Pia?

    • Closed: energy crosses but matter does not
    • Open: matter and energy cross
    • Isolated: nothing crosses

  10. Using the table, how much thermal energy was made in trial 1, Ren?

    • 550 J
    • 104 J
    • 50 J

  11. Using the table, how much kinetic energy did the cart gain in trial 2, Tala?

    Use the picture in question 8.

    • 184 J
    • 576 J
    • 24 J

  12. Using the table, how much gravitational energy did the cart gain in trial 3, Zee?

    Use the picture in question 8.

    • 196 J
    • 604 J
    • 204 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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