We add fertiliser to some plants but not others, then measure their height." What is the independent variable?, height of the plant, Amount of fertilizer, A student places ice cream in a hot room and a cold room to see how fast it melts. What is the independent variable?, Temperature of the room, Time taken to melt, A student throws a ball with different forces to see how far it travels. what is dependent variable?, Distance Travelled, Amount of force, A student changes the volume of a speaker to see how far the sound can be heard. What is the dependent variable?, Volume of speaker, Distance where sound can be heard, We test how different paper types absorb water. Name one controlled variable., Amount of water, Type of paper.

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