Mecânica e máquinas simples · GCSE Physics
Simulador do princípio de Bernoulli e sustentação
Simulador do princípio de Bernoulli e sustentação de aerofólios: tubo de Venturi
- No navegador
- Sem cadastro
- Dedução ao vivo
- Modo projetor
- Folha de exercícios A4
Janela de simulação 3D● 60 FPS
Variáveis de controle do experimento
m/s
°
m²
kg/m³
Deduções e métricas em tempo real
Velocidade do ar superior v_cima
--
Velocidade do ar inferior v_baixo
--
Diferença de pressão Δp
--
Sustentação total L
--
Dedução de fórmulas em tempo real
Fórmula fundamental:
--Substituição de valores:
--Estado físico: --
Exemplos clássicos e armadilhas de exame
Worked Problem
Problema: Why do two parallel ships traveling closely together risk colliding ("ship suction")?
Derivação passo a passo:
- Water between the hulls flows faster than water on the outside. By Bernoulli, internal pressure drops, and outside water pressure pushes the ships together.
Worked Problem
Problema: An aircraft wing of 30m² experiences 1200Pa pressure difference between lower and upper surfaces. Find total lift.
Derivação passo a passo:
- Lift L = Δp * S = 1200 * 30 = 36000 N.
Folha de investigação em aula e exercícios
Q1. Variant 1: Blowing air between two parallel hanging papers, do they separate or attract?
Answer Key: They attract together. Air velocity between papers increases, lowering pressure; higher outer atmospheric pressure pushes them inward.
Q2. Variant 2: Why must railway passengers wait behind yellow safety platform lines?
Answer Key: Passing trains create high-speed low-pressure zones near the tracks. Atmospheric pressure behind passengers could push them toward the moving train.
Q3. Variant 3: Why does a ping-pong ball levitate stably in a hair dryer upward airflow?
Answer Key: If the ball wanders off-center, faster airflow on the inner side creates lower pressure, producing a restorative Bernoulli pressure force back toward center.
Perguntas frequentes e erros comuns
Is the "equal transit time" theory of wing lift correct?
It is a debunked physics misconception! Wind tunnel tests prove upper airflow reaches the trailing edge much faster than lower airflow, not simultaneously.
How do aerobatic planes fly upside down with cambered wings?
Lift depends heavily on angle of attack. Inverted flight pitches the nose up, forcing oncoming air downward, generating upward reaction lift regardless of camber.
How do race car spoilers differ from aircraft wings?
Spoilers are inverted airfoils (cambered underneath), generating negative lift ("downforce") to press the tires against the asphalt for cornering grip.
How does an atomizer perfume sprayer use Bernoulli's principle?
High-speed air across the nozzle tip drops pressure; atmospheric pressure in the bottle pushes fluid up the tube where it is atomized into spray.