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11th grade The four fundamental forces worksheet

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The four fundamental forces

Grade 11 Science Worksheet - Challenge Me

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

  1. A nucleus of 64 nucleons has radius 1.2 × ∛64 fm. Protons 1 fm apart repel with 230.7 N. What force do two protons on opposite sides feel, to 0.01 N, Bo?

  2. A nucleus of 125 nucleons has radius 1.2 × ∛125 fm. Protons 1 fm apart repel with 230.7 N. What force do two protons on opposite sides feel, to 0.01 N, Esme?

  3. Jun says gravity must be the strongest force because it holds galaxies together. Agree or disagree?

    • Agree: galaxies show that gravity is the strongest
    • Agree: it beats the strong force
    • Disagree: it is weakest, but mass adds up

  4. Kira says the strong force must also pull on the Moon. Agree or disagree?

    • Agree: it keeps the Moon in orbit
    • Agree: it is the strongest force
    • Disagree: its range is far too short

  5. Luz says friction isn't a fifth fundamental force; it comes from electromagnetism. Agree or disagree?

    • Disagree: it comes from the weak force
    • Agree: it comes from charges in atoms
    • Disagree: it is a fifth fundamental force

  6. Two protons are 1 fm apart. Which is bigger, the electric push or the gravity pull, Milo?

    • The gravity pull, by about 10³⁶ times
    • The gravity pull, by a little
    • The electric push, by about 10³⁶ times

  7. At 1 fm, the strong pull between two protons beats their electric push. What happens at 3 fm, Noah?

    • Gravity takes over and pulls them in
    • The strong pull grows much stronger
    • The strong pull fades; the push wins

  8. Why can gravity hold a star together when the electric force is far stronger, Pia?

    • Its charges cancel; its mass doesn't
    • Stars contain no atoms
    • Electric forces stop working in space

  9. Why does the Sun use up its hydrogen slowly, over billions of years, Tala?

    • Gravity stops most of the Sun's reactions
    • Its core is too cold for fusion
    • Its first step relies on the weak force

  10. Which force squeezes the Sun's core hot and dense enough for fusion, Zee?

    • Gravity
    • Friction
    • The weak force
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11th grade The four fundamental forces worksheet – printable
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About this worksheet

The four fundamental forces. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can name the four fundamental forces and rank them: strong, electromagnetic, weak, gravity.
  • I can compare their ranges: the strong and weak forces reach about a nucleus or less; electromagnetism and gravity have no limit.
  • I can explain why gravity rules planets and stars (mass adds up, charges cancel) and why the strong force holds nuclei against the protons' electric push.
  • I can find a nucleus's radius from r = 1.2 × ∛A fm and the electric push between two protons from F = ke² ÷ r².

Standard: none (FL)

Words to know

fundamental force: One of the four basic forces every other push or pull comes from

strong force: The force that holds protons and neutrons together in a nucleus

weak force: The force behind some radioactive decays, changing neutrons into protons

range: How far a force reaches

femtometer (fm): 10⁻¹⁵ m, about the size of a proton

Common mistakes

Your child multiplied by the nucleon count itself. The radius grows with the cube root: r = 1.2 × ∛A fm.

Your child divided by the distance once. The electric force falls with the square of the distance.

Your child used the radius. Protons on opposite sides are a whole diameter apart, twice the radius.

Questions parents ask

What is the most common mistake with the four fundamental forces?

Your child multiplied by the nucleon count itself. The radius grows with the cube root: r = 1.2 × ∛A fm.

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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