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What difficulty would occur if the surface is changed in a spring-and-car experiment?

Answer and explanation

Correct answer: Surface friction will also affect the distance travelled

A controlled variable is a condition kept the same so that the experiment tests only the intended factor. Friction between the car and the surface can oppose motion and change how far the car travels. Different surfaces, such as smooth and rough ones, may provide different friction, so changing the surface introduces an extra factor and makes the comparison less fair.

If the spring compression is used to launch the car, the surface should remain unchanged while distance is measured. If the surface is changed, its friction may also change the travelled distance, even when the spring compression is identical. The result could then reflect both spring compression and surface friction. Thus option D correctly identifies the difficulty.

Related tags

FrictionConfounding-VariableSpring-CarVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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