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Motion and Force • Chapter Twelve: Distance, Time, and Speed • Chapter Thirteen: Forces • Chapter Fourteen: Force and Motion Chapter Twelve: Distance, Time, and Speed • 12.1 Distance, Direction, and Position • 12.2 Speed • 12.3 Graphs of Motion Investigation 12A Distance, Time, and Speed • How do scientists describe motion? 12.2 Speed • • • Speed is the most common measurement used to describe the motion of objects. Once you know an object’s speed, you can figure out how far it can go in a certain amount of time. You can also predict how long it will take to get somewhere. 12.2 Speed • The speed of a bicycle is the distance it travels divided by the time it takes. 12.2 Velocity • Speed with direction is called velocity. 12.2 Constant Velocity • • A plane with a constant velocity of 600 km/h west moves in a straight line. (Its speed and direction remain the same.) A car going around a bend at a constant 30 mph has a constant speed, but its velocity is not constant. (Note the change in direction.) 12.2 Average Speed • The speed found by dividing the total distance by the total time is the average speed. 12.2 Relationships between distance, speed and time • An equation can be used to calculate speed, distance, or time if two of the three values are known. Activity How Fast are You? • Speed is how fast something moves in relation to a reference point without regard to the direction. • In this activity you and a partner will each calculate your average speed in different units.