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# Kinetic energy Vector dot product (scalar product) Definition … - vector velocity calculator Lecture 10: Work and kinetic energy
? Kinetic energy
? Vector dot product (scalar product)
? Definition of work done by a force on an object
? Work-kinetic-energy theorem
Kinetic energy
= ?2
Kinetic energy is a scalar
It does not have components!
Unit: 2
= 2 = = Joule
Effect of force components
Components of force parallel
and perpendicular to velocity
have different effects.
FII causes change in magnitude of velocity vector (speed)
changes kinetic energy
F causes change in direction
does not change kinetic energy

How do you calculate velocity on a graph? time graph and without an equation given Plot a graph of displacement over time. Choose point A and another point B that is near to A on the line. Find the slope between A and B, calculate several times, moving A nearer to B. Calculate the slope for an infinitely small interval on the line. The slope obtained is instantaneous velocity. ...

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Title: Lecture 10
Author: Agnes
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