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AI marking for HSC Physics and Chemistry. Write real exam answers, get per-mark examiner-style feedback in seconds, across 12,000+ HSC-calibrated questions. Try it now, for free.

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Free for the 2026 HSC: the whole bank, AI marking and multiple choice. No card.

How it works

Watch Particle work.

One question, start to finish. The same loop you will run hundreds of times before the real exam.

1The question

A real answer.

Exam-style questions bounded to the NSW syllabus. Multiple choice and full written working, exactly like the paper.

Module 5 · Circular motion3 marks

A 0.50 kg ball on the end of a 1.2 m string is swung in a vertical circle. Determine the minimum speed the ball can have at the top of the circle for the string to remain taut.

Your working

At the top both forces pull down, so T + mg = mv² / r. Minimum speed is when the tension is smallest, so T = mg. Then 2mg = mv² / r, giving v = √(2gr) = √(2 × 9.8 × 1.2) = 4.8 m s⁻¹.

2The feedback

Judged line by line.

NESA-style bands, a per-mark breakdown, and exactly where the mark was lost. No more emailing your teacher and waiting days, then figuring it out yourself before they even reply.

Marked

2 / 3

Your force analysis at the top is right. The slip is that minimum speed is not the same as minimum tension.

Mark breakdown

1 mark: Correct force analysis at the top of the circle · Both forces act toward the centre there, and T + mg = mv²/r is exactly right.
1 mark: Identifying the limiting condition for the string to stay taut · You set "T = mg". The string is only just taut at the point where it goes slack, so the condition is T = 0.
1 mark: Algebra and evaluation carried from your own expression · "v = √(2gr) = 4.8 m s⁻¹" follows correctly from what you wrote, unit included, so this mark is carried.

To improve: When a question says minimum or just, write the limiting condition on its own line before you substitute anything. Here that line is T = 0, and it is worth a mark by itself.

3Your log

Every mistake, kept.

Each attempt lands in your log: the answer, the marks, the feedback. Nothing is lost, so you can close the gap for good.

Your history

Ball in a vertical circleaddedPhysics2/3 · just now

EMF in a rotating coilPhysics1/2 · yesterday

Titration of a weak acidChemistry3/3 · 2 days ago

4Your profile

Particle calibrates to you.

Every attempt sharpens a map of how you lose marks: knowledge, care, or vision. Then Particle hands you the questions that fix it.

By topic

Projectile motion82%

Circular motion61%

Electromagnetism38%

Particle says

Cayde, your last four EMF attempts dropped marks in the same spot: the direction of the induced current. The rest of your working is solid, so it's Lenz's Law that hasn't stuck yet. Give it twenty minutes before your next set and those become the easiest marks in Module 6.

5The bank

Not generated on demand.

We don't believe in AI slop. Every question is authored in advance, re-derived from scratch, and verified before it reaches you. 12,000+ of them, all the way down.

Circular motion

Ball in a vertical circlePhysics · 3 marksUnlocked

Banked curve with frictionPhysics · 4 marks1 more attempt

Conical pendulum designPhysics · 5 marks3 more attempts

12,000+

exam-calibrated questions

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7,000+

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Hard enough to matter. Marked like it counts.

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Try the marker, no account

Answer this. See what an examiner would give you.

A sealed vessel at

600 K

contains the equilibrium

N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)

Δ H = - 92.4 kJ mol^{- 1}

. Using collision theory, explain how raising the temperature of the vessel to

750 K

affects the value of

K_{e q}

for this system.(4 marks)

Three goes a day. Takes about ten seconds.