Demo. An invented family, made-up minutes, nobody's real child. The quizzes work: pass a round and watch the clock change.

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⚛️ Physics, NCEA

Years 11 to 13 · Read up first

10 questions. Get 8 right to earn 10 minutes. All 10 right = +5 bonus. They start easy and get harder as you go, so treat the first few as a warm-up. Every one you miss comes back with the answer and why.

1. Refraction is the

bouncing of light off a surfacesplitting of light into colours onlybending of light as it passes from one medium into anotherabsorption of light by a black surface

2. Newton's first law states that an object will remain at rest or move at constant velocity unless

acted on by an unbalanced (net) forcegravity stops acting on itit is touched by another objectit runs out of energy

3. The wave equation relates wave speed, frequency and wavelength as

speed = frequency minus wavelengthspeed = frequency times wavelengthspeed = frequency divided by wavelengthspeed = frequency plus wavelength

4. Sound waves are

not waves at alllongitudinal waves, where particles vibrate parallel to the direction of traveltransverse waves, where particles vibrate perpendicular to the direction of travelonly able to travel through a vacuum

5. Isotopes of an element have the same number of protons but a different number of

atomic numberprotonselectronsneutrons

6. Power is defined as

mass multiplied by gravityforce multiplied by distancethe total work done over the whole journeythe rate at which work is done (work done per second)

7. A force of 10 N moves an object 5 m in the direction of the force. How much work is done?

50 J15 J2 J500 J

8. The force that keeps an object moving in a circular path is called

friction only, in every casecentrifugal force, directed away from the centregravity onlycentripetal force, directed towards the centre of the circle

9. An object starts at rest and accelerates uniformly at 3 m/s squared for 4 seconds. Using s = ut + half at squared, what distance does it travel?

24 m6 m12 m48 m

10. A ball is thrown upward at 20 m/s. Using v squared = u squared - 2gs with g = 10 m/s squared, how high does it rise before its velocity reaches zero?

10 m40 m2 m20 m

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