Worksheet

The four fundamental forces

Grade 11 Science Worksheet - Challenge Me

NameDate

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

  1. A nucleus of 27 nucleons has radius 1.2 × ∛27 fm. Protons 1 fm apart repel with 230.7 N. What force do two protons on opposite sides feel, to 0.01 N, Ari?

  2. 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?

  3. 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?

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

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

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

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

  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 fades; the push wins
    • The strong pull grows much stronger

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

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

  9. As the Sun fuses hydrogen, a proton turns into a neutron. Which force allows this change, Ren?

    • Gravity
    • The weak force
    • The electromagnetic force

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

    • Gravity
    • Friction
    • The weak force
PencilGopencilgo.com

The four fundamental forces

Answer Key - Grade 11 Science Worksheet - Challenge Me

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

  1. A nucleus of 27 nucleons has radius 1.2 × ∛27 fm. Protons 1 fm apart repel with 230.7 N. What force do two protons on opposite sides feel, to 0.01 N, Ari?

    4.45 N

  2. 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?

    2.5 N

  3. 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?

    1.6 N

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

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

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

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

  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 fades; the push wins
    • The strong pull grows much stronger

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

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

  9. As the Sun fuses hydrogen, a proton turns into a neutron. Which force allows this change, Ren?

    • Gravity
    • The weak force
    • The electromagnetic force

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

    • Gravity
    • Friction
    • The weak force