PAX PAX Physics Fundamentals 1 — Questions and Answers
Question 1: Which of the following is the SI unit of force?
- Joule
- Newton (Correct answer)
- Watt
- Pascal
Correct answer: Newton
The Newton (N) is the SI unit of force, defined as kg·m/s².
Question 2: What happens to the speed of light as it moves from air into glass?
- It increases
- It stays the same
- It decreases (Correct answer)
- It doubles
Correct answer: It decreases
Light slows down when it enters a denser medium like glass.
Question 3: Which type of energy is stored in a compressed spring?
- Kinetic energy
- Thermal energy
- Potential energy (Correct answer)
- Chemical energy
Correct answer: Potential energy
A compressed spring stores elastic potential energy.
Question 4: An object in motion will remain in motion unless acted upon by an external force. This is Newton's:
- Second Law
- Third Law
- Fourth Law
- First Law (Correct answer)
Correct answer: First Law
Newton's First Law (law of inertia) states that objects maintain their state of motion unless a net force acts on them.
Question 5: What is the term for the bending of light as it passes from one medium to another?
- Reflection
- Diffraction
- Refraction (Correct answer)
- Dispersion
Correct answer: Refraction
Refraction is the bending of light when it passes between media with different densities.
Question 6: Which of the following correctly states the relationship between work, force, and distance?
- W = F + d
- W = F / d
- W = F × d (Correct answer)
- W = d / F
Correct answer: W = F × d
Work (W) equals force (F) multiplied by distance (d): W = F × d.
PAX PAX Physics Fundamentals 1
Which of the following is the SI unit of force?