Mecânica e máquinas simples · GCSE Physics Topic 5 (Simple Machines)
Simulador de plano inclinado e rosca de parafuso
Simulador de plano inclinado e roscas: vantagem mecânica e conservação do trabalho
- 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
m
N
Deduções e métricas em tempo real
Força ideal F0
--
Força real F
--
Vantagem mecânica
--
Rendimento mecânico
--
Dedução de fórmulas em tempo real
Fórmula fundamental:
--Substituição de valores:
--Estado físico: --
Exemplos clássicos e armadilhas de exame
Worked Problem
Problema: A winding mountain road is 3km long with 300m height gain. A 50000N truck faces 5*10^6 J friction work. Find useful work, total work and efficiency.
Derivação passo a passo:
- Useful work W_u = 50000*300 = 1.5*10^7 J. Total work W_t = 1.5*10^7 + 5*10^6 = 2.0*10^7 J. Efficiency η = 75%.
Worked Problem
Problema: Slope is 1m high, 4m long. A 300N pull moves an 800N load uniformly to the top. Find friction and efficiency.
Derivação passo a passo:
- W_total = 300*4 = 1200J. W_useful = 800*1 = 800J. Extra work W_extra = 400J. Friction f = 400/4 = 100N. Efficiency η = 66.7%.
Folha de investigação em aula e exercícios
Q1. Variant 1: Does an inclined plane have higher or lower efficiency when steeper?
Answer Key: Higher efficiency! Steeper slopes decrease normal force N=G*cosθ and friction, reducing wasted extra work (though requiring greater pulling effort).
Q2. Variant 2: Why do mountain roads wind in switchbacks instead of ascending straight up?
Answer Key: Winding curves increase road length L, lowering required uphill engine tractive effort by the inclined plane principle.
Q3. Variant 3: What are the trade-offs between finer (denser) vs coarser screw thread pitch?
Answer Key: Finer pitch creates a gentler slope, making tightening much easier and self-locking firmer, but requires more turns to drive in.
Perguntas frequentes e erros comuns
Can an inclined plane save work?
Never! The principle of work dictates no machine saves work. Saving force always requires traversing a proportionally greater distance.
How does a screw convert rotation to linear force with mechanical advantage?
A screw coils an inclined plane around a shaft. A modest torque applied at the perimeter translates along the thread pitch into immense axial clamping force.
Can inclined plane efficiency ever reach 100%?
Not in reality. Friction always causes unavoidable wasted heat work, bounding mechanical efficiency below 100%.
Is a wedge (axe blade or knife) an application of an inclined plane?
Yes! An axe is a double inclined plane placed back-to-back. Forward driving force decomposes into large lateral wedge splitting forces.