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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. ...

Title: Lecture 10

Author: Agnes

Creator: Microsoft® PowerPoint® 2013

Producer: Microsoft® PowerPoint® 2013

CreationDate: Thu Sep 24 08:29:02 2015

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