### **Category: Newton’s Gravitation**
- **100:** *What does Newton’s Law of Universal Gravitation state?*
**Answer:** What is the force between two masses is proportional to their product and inversely proportional to the square of the distance between them?
- **100:** *What law calculates the electric force between two charged objects?*
**Answer:** What is Coulomb’s Law?
- **100:** *What happens during nuclear fission?*
**Answer:** What is an atom's nucleus splits into smaller nuclei, releasing energy?
- **100:** *Which fundamental force governs gravitational interactions?*
**Answer:** What is the gravitational force?
### **Category: Mixed Bag**
- **100:** *What is the unit of force in the metric system?*
**Answer:** What is the Newton (N)?
- **200:** *What happens to the gravitational force if the distance between two objects is halved?*
**Answer:** What is the gravitational force quadruples?
- **200:** *Two charges, \(+3.0 \, \mu\text{C}\) and \(-2.0 \, \mu\text{C}\), are separated by 0.5 m. Calculate the electric force between them. \(k = 8.99 \times 10^9\).*
**Answer:** What is \(2.16 \, \text{N}\)?
- **200:** *What happens to mass during nuclear fusion and fission?*
**Answer:** What is some mass is converted into energy?
- **200:** *What are the four fundamental forces in nature?*
**Answer:** What are gravitational, electromagnetic, strong nuclear, and weak nuclear forces?
- **200:** *What happens to the gravitational force if one object's mass doubles?*
**Answer:** What is the force also doubles?
**300:** *Two planets are 10,000 km apart. One has a mass of \(3.0 \times 10^5\) kg, and the other has a mass of \(4.0 \times 10^5\) kg. Calculate the gravitational force between them. \(G = 6.67 \times 10^{-11}\).*
**Answer:** What is \(8.0 N )?
- **300:** *If two charges are both positive, what kind of force acts between them?*
**Answer:** What is repulsive force?
- **300:** *What is the main challenge of achieving nuclear fusion in a lab?*
**Answer:** What is the extreme temperature required to sustain the reaction?
- **300:** *What fundamental force is responsible for the attraction between opposite charges?*
**Answer:** What is the electromagnetic force?
- **300:** *If the charge of one object doubles, what happens to the electric force between it and another charged object?*
**Answer:** What is the force doubles?
- **400:** *What keeps a satellite in orbit around Earth?*
**Answer:** What is the gravitational force between the Earth and the satellite?
- **400:** *What happens to the electric force if the distance between two charges doubles?*
**Answer:** What is the force reduces to one-fourth?
- **400:** *Compare the energy released in nuclear fusion and fission.*
**Answer:** What is fusion releases significantly more energy than fission?
- **400:** *Which fundamental force is responsible for radioactive decay?*
**Answer:** What is the weak nuclear force?
- **400:** *Why is the force of gravity negligible between small objects like chairs in a room?*
**Answer:** What is because their masses are too small to create a noticeable force?
- **500:** *Explain the relationship between distance and the strength of gravitational force.*
**Answer:** What is gravitational force decreases as the square of the distance increases?
- **500:** *Why do electrons and protons in an atom attract each other?*
**Answer:** What is because they have opposite charges?
- **500:** *What fundamental force holds protons and neutrons together in the nucleus?*
**Answer:** What is the strong nuclear force?
- **500:** *What is the dominant force influencing the motion of galaxies in a cluster?*
**Answer:** What is the gravitational force?
- **500:** *What key difference separates gravitational force from electric force?*
**Answer:** What is gravitational force is always attractive, but electric force can be attractive or repulsive?