Balanced force, Equal forces, no motion change, Contact force, Force through physical touch, Friction, Resists motion, Force, Push or pull, Applied force, Force by an object or person, Gravity, Attracts objects towards each other, Interaction, 2 objects having action between objects, Motion, Change in position, Reference point, A place to compare if something is in motion or not, Unbalanced force, Not equal forces, motion is happening, Acceleration, how quickly an object's velocity changes, Speed, How fast an object moves; the distance traveled in a certain amount of time., Direction, The line or path along which something moves (north, south, left, right, etc.)., Kinetic Energy, Energy an object has because it is moving., Potential Energy, Stored energy an object has because of its position or condition (like a stretched rubber band or a ball at the top of a hill)., Conservation of Energy, The principle that energy cannot be created or destroyed, only changed from one form to another., Hypothesis, A testable prediction or educated guess about what will happen in an investigation. Often written as “If…, then…”, Variable, Anything that can change in an experiment., Independent variable (Manipulated variable), The one thing that is changed on purpose in an experiment to test its effect., Dependent variable (Responding variable), The factor that is measured or observed in response to the independent variable., Constant (Controlled variable), Things that stay the same during the experiment to make it fair., Quanitative, Measurements or amounts that use numbers (mass, length, time, temperature)., Qualitative, Descriptions based on qualities or observations using the five senses (color, smell, texture).

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