a research question, state a problem or question to be tested by scientific investigation, A Hypothesis, Is a clear tastable prediction using scientific reasoning, Independent variable, the variable that is being changed in an investigation, Dependent variable, The variable that is being measured in an investigation, Controlled Variable, A variable that is being kept the same, Contact force, A force which can be applied only when it is in contact with object, Non Contact forces, A force which can be applied without contact with object, Force, A push or a pull that causes a change in speed, direction, or shape of an object, Balanced forces, Two forces of equal size acting in opposite directions of an object, Unbalanced forces, Forces acting in opposite directions on an object are not equal in size, Mass, A measure of the amount of matter in an object, Weight, A force that act on mass due to gravity, Friction, A force that opposes the motion between any surfaces that are in contact

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