Parachutes, skydivers and falling safely
Tests: 5 of 11 right · Exam: 2 of 4 right · Kind: ★ · Understood: 6 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 3 of the physics course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.
Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.
Test 1 · ★ · right ✓
Is it true that a coin dropped from a really tall building could kill someone?
- 1. Yes, coins speed up for ever — no support
- 2. Yes, it falls faster than a bullet — no support
- 3. No, coins never reach the ground — no support
- 4. No, air slows it to a sting — ← Mova's choice · ✓ the right answer · score 3
Why: It took the question to ask which statement is true. It chose option 4 with score 3, the only option with support. Its support: lesson 3, line 16: «A penny dropped from a skyscraper is flat, light and tumbles, so air slows it to a speed that would sting but not seriously hurt.», reached through the same lesson line as the sentence the question matched. What matched: the same action «slow» (+2); the same doer «air» (+2). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Test 2 · ★ · wrong ✗
What would happen if a skydiver dived head first like an arrow?
- 1. They would stop in the air — ← Mova's choice · no support
- 2. They would fall much faster — ✓ the right answer · no support
- 3. They would rise back up — no support
- 4. They would fall more slowly — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 3 · ★ · right ✓
bruh my cat fell off the shed and landed on its feet so cats can fall off anything right
- 1. No, cats always land on their backs — no support
- 2. Yes, cats never get hurt — score 1
- 3. No, high falls still hurt cats — ← Mova's choice · ✓ the right answer · score 6
- 4. Yes, cats float when they fall — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 6, against 1 for the next best. Its support: lesson 3, line 12: «A falling cat twists its front half one way and its back half the other to turn its feet down, but high falls still hurt cats.», reached through the same lesson line as the sentence the question matched. What matched: the same action «hurt» (+2); the same doer «high falls» (+2); the same thing acted on «cats» (+2). · the question and its options parsed, with trees and pragmatics
Test 4 · ★ · wrong ✗
Which feeling is most like a lift starting to go down?
- 1. Walking slowly up a long flight of stairs — ← Mova's choice · no support
- 2. Standing very still in a long queue at school — no support
- 3. Going over a hump-backed bridge in a car — ✓ the right answer · no support
- 4. Lying quietly in bed at night, half asleep — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 5 · ★ · right ✓
You must drop an egg from a window without breaking it. Which idea is best?
- 1. Paint it so it is harder — no support
- 2. Land it on something soft that stops it slowly — ← Mova's choice · ✓ the right answer · score 2
- 3. Drop it faster so it is quick — no support
- 4. Hold it by a string and let go — no support
Why: It took the question to ask who or what does it. It chose option 2 with score 2, the only option with support. Its support: lesson 3, line 4: «Landing safely is about stopping slowly: an egg dropped on a pillow survives, but on the hard floor it stops in an instant and cracks.», reached through the same lesson line as the sentence the question matched. What matched: the same action «stop» (+2); the same property (+1). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Test 6 · ★ · wrong ✗
In a game a hero jumps off a cliff and lands on stone without a scratch. Why would a real jump hurt?
- 1. Gravity is stronger in real life — ← Mova's choice · no support
- 2. Real stone is sticky — no support
- 3. The hard stone stops the body in an instant — ✓ the right answer · no support
- 4. Real people are heavier than heroes in games — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 7 · ★ · wrong ✗
Your helmet fell off the table and has a tiny scratch. When must a helmet be replaced?
- 1. Never, because good helmets last for ever — ← Mova's choice · no support
- 2. After a big knock that crushes the foam — ✓ the right answer · no support
- 3. Every month, no matter what has happened — no support
- 4. After every single small scratch or mark — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 8 · ★ · wrong ✗
Why does hail dent cars but snow does not?
- 1. Snow is warmer than hail — ← Mova's choice · no support
- 2. Hail is pulled much harder by gravity than snow — no support
- 3. Snow is always wet and soft — no support
- 4. Hailstones are solid ice and fall much faster — ✓ the right answer · no support
Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 9 · ★ · wrong ✗
Why does a car have an airbag?
- 1. It makes the car lighter in a crash — ← Mova's choice · no support
- 2. It keeps the air fresh — no support
- 3. It makes the stop of your body slower and gentler — ✓ the right answer · no support
- 4. It pushes the car away from the other car in a crash — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 10 · ★ · right ✓
Without a parachute, why would a dandelion seed not travel far?
- 1. It would fly too high up to land anywhere — no support
- 2. It would fall quickly near its parent — ← Mova's choice · ✓ the right answer · score 4
- 3. It would start to grow while still in the air — no support
- 4. It would be much too heavy for the wind — no support
Why: It took the question to ask why something happens (its cause). It chose option 2 with score 4, the only option with support. Its support: lesson 3, line 9: «A dandelion seed is tiny and light, and its hairs make a big area for its weight, so it falls very slowly and the wind carries it far.», reached through the option's own match among the sentences about the question's things. What matched: the same action «fall» (+2); the same doer «seed» (+2). · the question and its options parsed, with trees and pragmatics
Test 11 · ★ · right ✓
Mate reckons a parachute works cos the cloth is lighter than air. right?
- 1. No, it works because air pushes on the big cloth — ← Mova's choice · ✓ the right answer · score 4
- 2. Yes, parachute cloth floats up — no support
- 3. No, it works because the cloth is heavy and steadies you — no support
- 4. Yes, it is filled with light gas — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 4, the only option with support. Its support: lesson 3, line 6: «A parachute's big cloth catches lots of air, and the push of the air grows with the area and the speed until it balances the skydiver's weight.», reached through the option's own match among the sentences about the question's things. What matched: the same action «push» (+2); the same doer «air» (+2). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the principal reason for which the deployment of a parachute diminishes the velocity of descent.
- 1. The canopy neutralises the gravitational attraction — ← Mova's choice · no support
- 2. The canopy draws the parachutist upwards towards the aircraft — no support
- 3. The extensive canopy encounters a considerable resistance of the air — ✓ the right answer · no support
- 4. The canopy is of lesser density than the surrounding air — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 2 · formal language · wrong ✗
Which of the following statements most accurately characterises the function of the foam lining of a cycling helmet?
- 1. It increases the rebound of the head from the ground — ← Mova's choice · no support
- 2. It reduces the weight of the head during a fall — no support
- 3. It prolongs the arrest of the head and so diminishes the force — ✓ the right answer · no support
- 4. It prevents the helmet from being displaced by a strong wind when cycling — no support
Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · right ✓
It is given that a coin is released from the summit of a tall building. Select the response consistent with the established facts concerning its descent.
- 1. The air restrains it to a speed insufficient to cause grave injury — ← Mova's choice · ✓ the right answer · no support
- 2. It accelerates without limit until impact — no support
- 3. It is borne upwards and does not descend — no support
- 4. It attains a velocity sufficient to prove fatal — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · right ✓
Ascertain the advantage to a tree of seeds that descend slowly.
- 1. The seeds germinate in the air some time before landing — no support
- 2. The seeds are rendered heavier upon landing — no support
- 3. The wind may convey them to a distance from the parent — ← Mova's choice · ✓ the right answer · score 6
- 4. The seeds are protected from all animals — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 6, the only option with support. Its support: lesson 3, line 9: «A dandelion seed is tiny and light, and its hairs make a big area for its weight, so it falls very slowly and the wind carries it far.», reached through a sentence linked to the one the question matched. What matched: the same action «carry» (+2); the same doer «wind» (+2); the same thing acted on «seed» (+2). · the question and its options parsed, with trees and pragmatics
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/physics/3-parachutes-and-falling-safely/