A good way to get across the meaning of units that are used in physics for measuring physical quantities is to 'personalize' them. Dealing (through estimations and simple experiments) with students' ideas about velocities, accelerations, forces, energies or powers is very helpful in building their intuition about the orders of magnitude of different physical quantities. In such activities students acquire the necessary knowledge that they are likely to use to judge the feasibility of results obtained in physics exercises and problems. Personal involvement should not end with numbers, but might be extended further to provide the kinesthetic base for a better understanding of mechanical concepts and laws [1].
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