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Resumos gratuitos de Física
Respostas passo a passo às perguntas mais comuns de Física, com exemplos resolvidos, erros comuns e dicas de prova.
Resumos gratuitos de Física
8 resumos
What is Newton's second law and how do you use F = ma?
Newton's second law says the resultant force on an object equals its mass multiplied by its acceleration: F = ma, with F in newtons (N), m in kilograms (kg) and a in…
How do you calculate resistance using Ohm's law?
Ohm's law links voltage, current and resistance: V = IR, where V is the potential difference in volts (V), I is the current in amps (A) and R is the resistance in ohms…
What is the difference between speed and velocity?
Speed tells you how fast something is moving. Velocity tells you how fast and in which direction. Speed is a scalar quantity (size only) and velocity is a vector…
How do you calculate the kinetic energy of a moving object?
Kinetic energy = ½ × mass × speed², written Eₖ = ½mv². Use mass in kilograms and speed in metres per second to get the energy in joules (J). Because speed is squared…
How do you calculate density?
Density = mass ÷ volume, written ρ = m ÷ V. With mass in kilograms and volume in cubic metres, density is in kg/m³; with grams and cm³, it is in g/cm³. An object floats…
How do you use the wave equation v = fλ?
Wave speed = frequency × wavelength, written v = fλ. Speed is in metres per second (m/s), frequency in hertz (Hz) and wavelength in metres (m). If the frequency…
What is the difference between series and parallel circuits?
In a series circuit the components are connected one after another in a single loop, so the same current flows through each one and the voltage is shared between them…
How do you calculate momentum and use conservation of momentum?
Momentum = mass × velocity, written p = mv, in kilogram metres per second (kg m/s). In a collision or explosion with no external forces, total momentum before equals…