🔬 Physics & Forces Trivia Questions & Answers
Gravity, energy, relativity and the laws that govern the universe. Below are 30 free physics & forces trivia questions with answers — part of Science trivia on BUZZ. Want a real challenge that adapts to what you know? Play the Science quiz — no signup needed to start.
30 Physics & Forces trivia questions
Q1. What do physicists call any push or pull that can change an object's motion?
Answer: Force
💡 Forces are measured in newtons; a small apple weighs roughly one newton in your hand.
Q2. Which kind of energy does any moving object carry?
Answer: Kinetic energy
💡 Double a car's speed and its kinetic energy quadruples, which is why fast crashes are so violent.
Q3. What is the speed of light in a vacuum approximately?
Answer: 300,000 km/s
💡 Light from the Sun takes about 8 minutes to reach Earth.
Q4. The SI unit of energy honors which English physicist who studied heat's mechanical equivalent?
Answer: James Prescott Joule
💡 One joule is a tiny amount of energy — about what it takes to lift a small apple one metre straight up. Your phone charger moves thousands of them every second.
Q5. Which type of friction has to be overcome first before a stationary object will even start sliding?
Answer: Static friction
💡 Static friction is usually the stronger of the two — that's why a heavy box feels hardest to move in the very first instant, then suddenly gets easier to keep sliding once kinetic friction takes over.
Q6. Which simple machine did Archimedes mean, boasting he could move Earth with a long enough one?
Answer: The lever
💡 Archimedes had worked out mechanical advantage: the longer the arm on the effort side of a lever's fulcrum, the less force it takes to shift a huge load on the other side — in theory, at least, given an impossibly long bar.
Q7. What is the combined electric and magnetic push on a moving charged particle called?
Answer: Lorentz force
💡 The Lorentz force makes electric motors and generators work, uniting electric and magnetic effects in one equation.
Q8. What is the SI unit of electric current?
Answer: Ampere
💡 Named after French physicist André-Marie Ampère. An ampere is one coulomb of charge per second. A typical phone charger draws 1–2 amperes.
Q9. What is the product of an object's mass and its velocity called?
Answer: Momentum
💡 A slow, heavy truck and a fast, light bullet can carry surprisingly similar momentum.
Q10. Energy stored in an object because of its height or position is which type?
Answer: Potential energy
💡 A boulder perched on a cliff holds huge potential energy that becomes motion the instant it falls.
Q11. What is the SI base unit of length?
Answer: Metre
💡 Since 1983 the metre has been defined by how far light travels in a tiny fraction of a second.
Q12. What is the speed of light in a vacuum (to 3 significant figures, in m/s)?
Answer: 300000000
💡 More precisely, light travels at 299,792,458 metres per second.
Q13. Which type of radiation is stopped by a sheet of paper?
Answer: Alpha
💡 Alpha particles are relatively large and heavy, so they cannot penetrate paper or even the outer layer of skin — though they are dangerous if inhaled or ingested.
Q14. What is absolute zero in Celsius?
Answer: -273.15°C
💡 Absolute zero is the theoretical temperature at which particles have no thermal motion.
Q15. Which particle carries a negative electrical charge?
Answer: Electron
💡 Electrons orbit the nucleus of an atom and are responsible for chemical bonding and electrical current.
Q16. In 1971, astronaut David Scott dropped a hammer and feather on the Moon to prove what falls equally?
Answer: All objects regardless of mass
💡 With no air to slow the feather down, both objects hit the lunar dust at the exact same moment, exactly as Galileo had argued centuries earlier — gravity doesn't care how heavy you are.
Q17. Archimedes leapt from his bath shouting one word, having found how to expose a fake crown via what?
Answer: The water it displaced
💡 The principle bearing his name says a submerged object displaces fluid equal to its own volume — weigh that displaced water and you can catch a crook slipping cheaper silver into a 'gold' crown.
Q18. What unit did engineer James Watt invent to compare steam engines to the animal they replaced?
Answer: Horsepower
💡 Watt calculated a horse could shift 33,000 pounds one foot every minute, padded the number up for good measure, and the unit stuck around long after horses left the job.
Q19. Legend says Galileo noticed a lamp's swing rhythm never changed with amplitude while sitting where?
Answer: A cathedral in Pisa
💡 He reportedly timed the swings against his own pulse. The insight — that a pendulum's period depends only on its length and gravity, not how wide it swings — later let Christiaan Huygens build the first accurate pendulum clock.
Q20. Per the pendulum formula T = 2π√(L/g), which two factors set how long a swing takes?
Answer: Its length and the local gravity
💡 Swing amplitude and the bob's mass barely matter for small swings — only a longer string or weaker gravity will slow the tempo down, which is exactly why a metronome-like clock pendulum works so reliably.
Q21. In 1851, Léon Foucault hung a giant Paris pendulum to prove which everyday fact?
Answer: That the Earth itself rotates
💡 Foucault's pendulum hung from the dome of the Panthéon and appeared to slowly change its swing direction over the day — really, the building (and the whole planet under it) was the thing rotating, not the pendulum.
Q22. Which type of radiation has the highest energy?
Answer: Gamma rays
💡 Gamma rays are the most energetic form of electromagnetic radiation. They can penetrate most materials and are produced by nuclear reactions and supernovae.
Q23. What is Newton's first law of motion also called?
Answer: Law of inertia
💡 Inertia is the tendency of an object to resist changes in its state of motion. A spacecraft in deep space with no forces acting on it will travel forever at the same speed.
Q24. What is the unit of electrical resistance?
Answer: Ohm
💡 The ohm (Ω) is named after Georg Ohm, who in 1827 discovered the relationship between voltage, current, and resistance that became Ohm's Law.
Q25. What is the speed of sound in air at sea level (approximately)?
Answer: 343 m/s
💡 The speed of sound varies with temperature. At 20°C it's ~343 m/s. Aircraft that break this barrier create a 'sonic boom' — a shockwave, not an explosion.
Q26. Which law states that energy cannot be created or destroyed, only transformed?
Answer: First law of thermodynamics
💡 The first law of thermodynamics is conservation of energy. The second law says entropy (disorder) always increases — which is why your desk doesn't spontaneously tidy itself.
Q27. Which everyday metal is the best practical conductor of electricity?
Answer: Copper
💡 Silver conducts slightly better than copper, but copper is far cheaper, so it fills our wires.
Q28. Between two touching objects, which way does heat naturally flow on its own?
Answer: Hot to cold
💡 This one-way flow is the very heart of the second law of thermodynamics.
Q29. Sound is which type of wave, with its vibrations along the direction of travel?
Answer: Longitudinal
💡 Light, by contrast, is a transverse wave, vibrating at right angles to its direction of travel.
Q30. What is the unit of frequency, defined as one cycle per second?
Answer: Hertz
💡 It honours Heinrich Hertz, who first produced and detected radio waves in the 1880s.
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