The four fundamental forces
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
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?
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?
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?
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
Kira says the strong force must also pull on the Moon. Agree or disagree?
- Disagree: its range is far too short
- Agree: it is the strongest force
- Agree: it keeps the Moon in orbit
Luz says friction isn't a fifth fundamental force; it comes from electromagnetism. Agree or disagree?
- Disagree: it comes from the weak force
- Disagree: it is a fifth fundamental force
- Agree: it comes from charges in atoms
Two protons are 1 fm apart. Which is bigger, the electric push or the gravity pull, Milo?
- The gravity pull, by a little
- The electric push, by about 10³⁶ times
- The gravity pull, by about 10³⁶ times
Why can gravity hold a star together when the electric force is far stronger, Pia?
- Electric forces stop working in space
- Stars contain no atoms
- Its charges cancel; its mass doesn't
As the Sun fuses hydrogen, a proton turns into a neutron. Which force allows this change, Ren?
- The electromagnetic force
- Gravity
- The weak force
Which force squeezes the Sun's core hot and dense enough for fusion, Zee?
- The weak force
- Gravity
- Friction