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..

Year 7 Physics

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