Friction - The force applied to the surface of an object when it moves against the surface of another object. , Independent Variable (IV) - The single factor the experiment is changing, for example, the surface of a ramp., Dependent Variable (DV) - The factor that is being measured, for example friction., Controlled Variable (CV) - The factors that need to be kept the same in each test, so the only difference is the IV., Hypothesis - Your prediction of what will happen in the experiment. It does not have to be correct., Mass - The amount of matter in an object., Acceleration - The items ability to gain speed., Force - An influence that can change the motion of an object. It can be described as push or pull., Non contact force - Gravity, magnetism, electrostatic. An example is the moon orbiting earth., Contact force - A force that involves direct contact between two objects., Newton meter or spring balance - Measures force in N., Newtons or N - Is the unit of measurement for force., Balanced force - A force that is opposite in direction and equal in size. For example sitting on a branch in a tree., Unbalanced force - When a force applied in one direction is greater than the force applied in the opposite direction. When acting on an object, there is a change in speed or direction.,

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