Mecánica y máquinas simples · GCSE Physics Topic 5
Simulador de la tercera ley de Newton
Simulador de la tercera ley de Newton vs fuerzas equilibradas: acción y reacción
- Cálculo en cliente
- Sin registro
- Derivación en vivo
- Modo proyector
- Hoja de trabajo A4
Ventana de simulación 3D● 60 FPS
Variables de control del experimento
N
kg
kg
Derivaciones y métricas en tiempo real
Rozamiento máximo del equipo A
--
Rozamiento máximo del equipo B
--
Tensión de la cuerda
--
Resultado
--
Derivación de fórmulas en tiempo real
Fórmula básica:
--Sustitución de valores:
--Estado físico: --
Ejemplos clásicos y análisis de errores en exámenes
Worked Problem
Problema: If team A pulls team B over, does team A exert greater pull on team B than B on A?
Derivación paso a paso:
- 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
Problema: A teacup rests on a table. Identify the balanced pair and the action-reaction pair.
Derivación paso a paso:
- 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).
Hoja de indagación en clase y tareas
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.
Preguntas frecuentes y errores conceptuales
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.