Механика и простые механизмы · GCSE Physics Topic 5
Симулятор третьего закона Ньютона
Симулятор третьего закона Ньютона vs сил равновесия: действие и противодействие
- В браузере
- Без регистрации
- Вывод формул
- Режим проектора
- Печатный лист A4
Окно 3D симуляции● 60 FPS
Параметры эксперимента
N
kg
kg
Расчёты и показатели в реальном времени
Макс. трение команды A
--
Макс. трение команды B
--
Натяжение верёвки
--
Результат
--
Вывод формул в реальном времени
Основная формула:
--Подстановка значений:
--Физическое состояние: --
Разбор типовых задач и анализ экзаменационных ошибок
Worked Problem
Условие задачи: If team A pulls team B over, does team A exert greater pull on team B than B on A?
Пошаговый вывод формул:
- No! By Newton's 3rd law, the forces between A and B on the rope are strictly equal. Team A wins because ground friction on A exceeds that on B.
Worked Problem
Условие задачи: A teacup rests on a table. Identify the balanced pair and the action-reaction pair.
Пошаговый вывод формул:
- Balanced pair: gravity on cup and upward normal force from table on cup (act on same object). Action-reaction pair: downward press on table by cup and upward normal force on cup by table (act on different objects).
Рабочий лист для урока и домашние задания
Q1. Variant 1: Why use a light card instead of a heavy wooden block in balanced forces experiments?
Answer Key: Light card mass minimizes gravity interference, and hanging in air eliminates surface friction.
Q2. Variant 2: Tilting the card makes it spin upon release. What condition does this prove?
Answer Key: It proves that balanced forces must act along the exact same straight line (collinear).
Q3. Variant 3: Cutting the card in half causes each piece to fly away. What condition does this demonstrate?
Answer Key: It demonstrates that balanced forces must act on the very same single object.
Часто задаваемые вопросы и типичные заблуждения
What is the fundamental difference between action-reaction and balanced forces?
Action-reaction forces act on two different bodies and never cancel each other. Balanced forces act on the same body and sum to zero.
When walking forward, which force pushes the person forward?
The foot pushes backward against the ground. The ground exerts an equal and opposite forward static friction on the foot, propelling the person forward.
When jumping, normal force exceeds gravity. Does normal force still equal foot pressure on ground?
Yes, absolutely! Normal force and foot pressure are an action-reaction pair and are identically equal at all instants.
What practical advice helps win a tug-of-war?
1) Heavier team members (increases normal force); 2) shoes with high friction tread (increases μ); 3) lean back to lower center of gravity.