Lesson+17+&+18

**﻿Advancememt in Physics @ Dwight Englewood** **Director: Elise Burns** **TA: Sebastian Luhol**

where **m** = mass of object
 * What is the definition of work and what is the equation? **Work if the transfer of motion, there must be a displacement and the force must cause the displacement.
 * How do you calculate work? **Work(J)= Force(N) x Distance(M)
 * What is the definition of potential energy? **Porential Energy is "stored" energy of position ossessed by an object.
 * Define kinetic energy? **Kinetic Energy is the energy of motion, when an object moves vertically or horizontally it has kinetic energy.
 * v** = speed of object


 * Give an example of mechanical energy? **
 * What is power? **Power is the rate that work is done.

<span style="font-family: 'Courier New',Courier,monospace; font-size: 110%; line-height: 0px; overflow: hidden;">﻿<span style="background-color: #d0ebfb; color: #ff0044; font-family: Verdana,Geneva,sans-serif; font-size: 110%;"> <span style="background-color: #d0ebfb; color: #ff0044; font-family: Verdana,Geneva,sans-serif; font-size: 110%; line-height: 0px; overflow: hidden;">
 * <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">What are the differences of Internal and External Forces? **
 * **Internal Forces** || **External Forces** ||
 * **Fgrav** **Fspring** || **Fapp** **Ffrict** **Fair** **Ftens** **Fnorm** ||

<span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">Work is caused by a force acting on the axis of direction of motion <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">symbol: " W " <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">eqution: (F)(d)(cos Φ) F= force, d+ distance traveled NOT displacement Φ= angle between force and direction of motion <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">cue: N T or f along axis of motion

<span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">Kinetic Energy is due to the motion of an object, any ogject thats moving has kinetic energy <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">symbol: " KE " <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">equation: ½ mv ² <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">cue: object is moving

<span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">Gravitational Potential Energy is possessed by an object because it is above or below 0 level wherever you make zero [ usually the floor ] <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">symbol: " GPE " or "PEg " <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">equation: mgh <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">cue: above or below aero position

<span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">Elastic Potential Energy is ever gy possessed by an object due to compressed or straight spring <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">symbol: " EPE " <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">equation: ½ kx ² <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">cue: stretched or compressed

<span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">unit= JOULES !! <span style="font-family: 'Courier New',Courier,monospace; font-size: 110%;">symbol: " J "