ch12 speedsection2
TRANSCRIPT
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Motion and Force
• Chapter Twelve: Distance, Time, and Speed
• Chapter Thirteen: Forces
• Chapter Fourteen: Force and Motion
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Chapter Twelve: Distance, Time, and Speed
• 12.1 Distance, Direction, and Position
• 12.2 Speed
• 12.3 Graphs of Motion
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Investigation 12A
• How do scientists describe motion?
Distance, Time, and Speed
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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.
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12.2 Speed
• The speed of a bicycle is the distance it travels divided by the time it takes.
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12.2 Velocity
• Speed with direction is called velocity.
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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.)
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12.2 Average Speed• The speed found
by dividing the total distance by the total time is the average speed.
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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.
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Activity
• 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.
How Fast are You?