The four fundamental forces

Answer Key - Grade 11 Science Worksheet - Building Confidence

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

1. 1.

   A nucleus has 8 nucleons. Using r = 1.2 × ∛A fm (1 fm = 10⁻¹⁵ m), what is its radius, in fm, Ari?

   2.4 fm
2. 2.

   A nucleus has 27 nucleons. Using r = 1.2 × ∛A fm (1 fm = 10⁻¹⁵ m), what is its radius, in fm, Bo?

   3.6 fm
3. 3.

   A nucleus has 64 nucleons. Using r = 1.2 × ∛A fm (1 fm = 10⁻¹⁵ m), what is its radius, in fm, Esme?

   4.8 fm
5. 4.

   Using the table, which force is strongest, Jun?

   • The weak force
   • The strong force
   • Gravity
6. 5.

   Using the table, which two forces reach out with no limit, Kira?

   Use the picture in question 4.

   • The strong and the weak forces
   • Electromagnetic and gravity
   • The weak force and gravity
7. 6.

   Using the table, which force has the shortest range, Luz?

   Use the picture in question 4.

   • Gravity
   • The weak force
   • The electromagnetic force
8. 7.

   Which force keeps the Moon in orbit around Earth, Milo?

   • Gravity
   • The strong force
   • The weak force
9. 8.

   Which force makes a rubbed balloon stick to a wall, Noah?

   • Gravity from the wall's mass
   • The strong force
   • The electromagnetic force
10. 9.

    Which force holds protons and neutrons together in a nucleus, Pia?

    • The electromagnetic force
    • The strong force
    • Gravity
11. 10.

    Friction between a book and a table comes from which fundamental force, Ren?

    • The weak force
    • The electromagnetic force
    • Gravity between the atoms