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Physics · Class 9
A physics investigation still needs one independent variable, one dependent variable, and control variables held still. Repeats reduce random error. A hypothesis is a testable 'if... then', not a hope. This is the same method idea as chemistry, with metres, seconds, and newtons.
PracticeOne of the main aims of physics is to develop a clear and testable understanding of the physical universe. Physicists ask questions such as: • How do objects move? • Why do objects fall? • How is energy transferred? • How do light and sound travel? • How do electric and magnetic effects occur? • How can physical behaviour be predicted? To answer such questions, physics combines observation, mea
PracticeAn engineer must build something that works in the real world. Cost, safety, time, and materials all matter. A crane must lift scrap and also drop it. A clinic thermometer must not shatter and must be readable. That is more than knowing the formula.
PracticeA law is a short, reliable pattern, often an equation. It tells what happens, again and again, in a stated range. It does not by itself tell the full story of why. Hooke's law: F = k x (only up to a limit). Newton's second law: F_net = m a (for ordinary speeds and sizes). Energy is conserved.
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