a push or a pull, force, unit of measurement for force, Newtons (N), tool used to measure force, Spring Scale, a pulling force that pulls things down towards the center of the Earth, gravity, a pulling force that acts against motion to slow down or stop things from moving, friction, a pulling force when placed near magnetic objects, magnetic force, a pushing force created by particles in the air that act against gravity, air resistance, a statement of an idea that can be tested experimentally, hypothesis, the part of an experiment you select to change or test, Independent Variable (or manipulated variable), the thing you are measuring that responds to the way you set up the experiement, Dependent Variable (responding variable), things or conditions (part of test) that must stay the same in each trial, Constant, the results obtained by investigation and the opinion reached based on the test, Conclusion.

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