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Give two uses of pulleys?

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What is the most important invention of human history?

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What are fossil fuels?

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How aquatic animals get oxygen?

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What is chemical energy?

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When gear system used to increase the force?

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Define simple machine with examples?

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What are the advantages of solar energy?

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How are wheel and axle , pulley and gears alike?

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Write the uses of solutions and suspensions in daily life.

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Investigate the effects of temperature on solubility?

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Explain the law of conservation of energy?

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Expalin how one form of energy can be converted into other form of energy.

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Explain the working of a bicycle?

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Distinguish between aqueous, dilute and concntrated solutions.

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Prove that water is a universal solvent?

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Differentiate between solute, solvent and solution

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Explain the particle model of solution?

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Write uses of gears in everyday life.

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Describe how motion in a system of pulleys of different sizes is transferred to motion in an other system of various gears in the same structure

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