Describing Motion

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# Describing Motion - PowerPoint PPT Presentation

Describing Motion. 1-D Kinematics. Kinematics. Science of describing motion. Words Diagrams Numbers Graphs Equations Develop sophosticated mental models that describe the motion of real-world objects. Coordinate Sytems.

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## Describing Motion

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Describing Motion

1-D Kinematics

Kinematics
• Science of describing motion.
• Words
• Diagrams
• Numbers
• Graphs
• Equations
• Develop sophosticated mental models that describe the motion of real-world objects.
Coordinate Sytems
• System used to describe motion that indicates when the zero point of the variable is located and the direction in which the values of the variable increase.
• Origin: point in which the variable has a value of zero.
• Position vector: arrow used to identify the position of the moving object at any given time.
• Length of the position vector is proportional to the distance of the object from the origin and points of origin to the location of the moving object at a particular time.
Scalars
• Quantities that are described by magnitude (numerical value) only.
• Time
• Mass
• Temperature
Vectors
• Describe magnitude and direction
• Acceleration
• Velocity
Distance and Displacement
• Distance: scalar quantity. It is referring to how far an object moves “distance covered”.
• d0 to d1
• Displacement: vector quantity. Refers to the distance and direction Δd = d1 – d0
Velocity vs Acceleration
• Velocity: speed and direction that an object moves.
• Vector quantity
• Speed =distance traveled/time of travel s = d/t
• Velocity = Δposition/time = Δd /Δt
• Instantaneous speed is speed at any given point of time.
• Average speed – average of all instantaneous speeds.
• Vector quantity
• Constant Acceleration : when an accelerating object changes Its velocity by the same amount each second.
• Average acceleration = Δ velocity/time or

a = vf - vi / t