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

   3.6 fm
3. 2.

   Using the table, which force is strongest, Jun?

   • The weak force
   • The strong force
   • Gravity
4. 3.

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

   Use the picture in question 2.

   • The strong and the weak forces
   • Electromagnetic and gravity
   • The weak force and gravity
5. 4.

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

   Use the picture in question 2.

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

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

   • The weak force
   • The strong force
   • Gravity
7. 6.

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

   • The electromagnetic force
   • Gravity from the wall's mass
   • The strong force
8. 7.

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

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

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

   • The electromagnetic force
   • Gravity between the atoms
   • The weak force
10. 9.

    A table pushes up on a resting cup. Which fundamental force is behind this push, Tala?

    • Gravity pulling the table upward
    • Electromagnetic, between atoms
    • The strong force
11. 10.

    Which force lets a neutron change into a proton in some radioactive decays, Zee?

    • The weak force
    • Friction
    • Gravity inside the nucleus