What is the unit for frequency? - The unit of frequency is Hertz (Hz), What is the purpose of the Earth wire? - It acts as a safety device, What is the conservation of energy? - Energy cannot be created or destroyed, only transferred and transformed, How do you make an electricmagnet? - Wrap wire around a soft iron nail and pass a current through the wire, Why is the gravitational field strength different on different planets? - It depends of the planets mass and radius, How does pressure change when area decreases, assuming the force stays the same? - Pressure increases as area decreases, What does the gradient of a velocity-time graph represent? - It represents the acceleration, What does the atomic number of an atom represent? - The atomic number represejts the number of protons in an atom,

Physics IGCSE topics

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