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Unit 7 Vocabulary and Key Understandings Speed- distance an object travels in a given amount of time: Speed = Distance/Time Velocity- the distance and direction an object is traveling Acceleration- a change in velocity (speed and/or direction) Motion- a change in position measured by distance and time Force- a push or a pull Unbalanced force- forces that cause a change in an objects motion Balanced force- forces that cancel each other out Kinetic energy- energy of motion Potential energy-energy stored in an object due to the objects position Direction- the direction or course an object is traveling or is aimed to travel Distance- how far an object traveled Displacement- the direction and distance between the starting point and ending point Position- the location of an object compared to a reference point Friction- a force that opposes motion between objects that are touching Line graph- graph used to represent the relationship between two variables. Constant speed- to travel at a steady pace not changing the speed of an object. Relative motion- the motion of an object as compared to another object Dependent variable- the factor in an experiment that is measured and may change as a result of changing the independent variable Independent variable- the factor in an experiment that is changed on purpose Key Understandings: Energy can be categorized as potential or kinetic Unbalanced forces cause changes in an object’s position, speed, and direction The speed of an object can be calculated, and changes in motion of the object can be measured and graphically represented.