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

absorption of light by a black surfacesplitting of light into colours onlybouncing of light off a surfacebending of light as it passes from one medium into another

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) forceit is touched by another objectit runs out of energygravity stops acting on it

3. Work done is calculated as

force times distance moved in the direction of the forceforce times timemass times velocityforce divided by distance

4. In a series circuit, the current at every point in the circuit is

different at each componenthighest near the battery onlythe same throughoutzero unless a switch is closed at both ends

5. Newton's second law is summarised by the equation

Force = mass plus accelerationForce = mass times velocityForce = mass times accelerationForce = mass divided by acceleration

6. The pitch of a sound is determined mainly by its

wavelength alone, regardless of frequencyspeed of travelamplitude (higher amplitude gives higher pitch)frequency (higher frequency gives higher pitch)

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

50 J500 J15 J2 J

8. In a closed system with no external forces, total momentum before a collision is

always zero after the collisionalways doubled after the collisionunrelated to momentum after the collisionequal to total momentum after the collision (momentum is conserved)

9. Two identical cars travel at the same speed around two different bends: Bend A has a small radius, Bend B has a large radius. Which car needs a greater centripetal force to stay on its path?

The car on Bend A (small radius), since centripetal force increases as radius decreasesNeither needs any centripetal forceThe car on Bend B (large radius), since force increases with radiusBoth need exactly the same force

10. A 0.5 kg ball moving at 6 m/s hits a wall and bounces straight back at 4 m/s. What is the magnitude of the change in momentum (the impulse delivered by the wall)?

5 kg m/s2 kg m/s1 kg m/s10 kg m/s

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