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: it beats the strong force
- Agree: galaxies show that gravity is the strongest
- 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
- Agree: it comes from charges in atoms
- Disagree: it is a fifth fundamental force
At 1 fm, the strong pull between two protons beats their electric push. What happens at 3 fm, Noah?
- The strong pull fades; the push wins
- Gravity takes over and pulls them in
- The strong pull grows much stronger
Why can gravity hold a star together when the electric force is far stronger, Pia?
- Electric forces stop working in space
- Its charges cancel; its mass doesn't
- Stars contain no atoms
As the Sun fuses hydrogen, a proton turns into a neutron. Which force allows this change, Ren?
- Gravity
- The weak force
- The electromagnetic force
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