all right here’s the KE boosted slouse and the narration so far answer these questions for me if you can answer these questions you ready for the advanced what is energy this is review it’s on page six and your indicates I’m okay if you don’t know this one measure of how much work an objective can do what is kinetic energy if you don’t know this question don’t watch this video moving objectives can do work if you don’t know this question go back and watch basic and proficient because you need to know this faster objects move more and can do more occupation and V squared equals big change in ke all right onto advanced I’m butta butta butta butta Bob we’re not going to watch this cartoon if you want to watch the cartoon you should have been in class okay mm okay give me a second let’s change a few things okay first thing this is advanced on sheet 15 and it’s a relation between kinetic energy and succeed and the big idea is changing kinetic energy equals working here takes employment sorry it so start time up now and act down with me it makes work to change kinetic energy not question exclamation it takes work to do kinetic energy for example we have this car and we don’t really know how fast it’s going what we do know but we don’t know everything about it but I can go ahead and say that if it’s at vir ova lhasa t yeah the kinetic energy equals 0 but once it’s going up to 40 well let’s summon this ke mucho it’s a lot I don’t know mass I don’t feel like doing math right now so whatever I want to know is weird all this exertion come from it departed from zero to a ton to come from and the answer is right here the engine did work and that tells us the kinetic energy the engine did work that equates for the conversion that’s where the vigour came from the work done by the engine so let’s outline this instance number 1 for me write down example number one engine does work to increase the energy of a auto and attract this you can draw up big or gleaning a lot but we’re going to line all over this so I miss you to draw this big made room in between this writing here it’s not the scale and pause the video if you need more duration I’m going to go on that you can pause me so let’s look at this illustration right here okay k e equals zero right here k e equals we don’t know but if we can find it we can find the remained unchanged get from zero to what and that tells us the change in kinetic energy so for example if we go let’s say this is a one-kilogram let’s make this easy please one kilogram please discovery the kinetic energy at the end of this wood observation of this moving object find what the kinetic energy final is you need to be able to do this in order to even start this difficulty if you don’t know how to find the kinetic energy final go back to the basic video we have 1 goes 4 T squared divided among 2 equals 4 T squared is 16 hundred divided among 2 equals eight hundred joules okay so ke right here equals eight hundred joules fairly first thing I’m going to ask you is how much work was done and look at this formula and tell yourself the answer how much work was done and now we go the answer is well eight hundred joules because nonetheless much kinetic energy changed that’s how much work was done now let’s make this an advanced problem so we have a car I know that the change in ke equals manipulate I’m going to say this distance was 10 rhythms on the advanced question I’m going to ask you how much thrust was applied given this information right here here’s how we do it we know kinetic change in kinetic energy equals eight hundred that signifies undertaking equals eight hundred if creation equals eight hundred impel equals? and length equals ten solve for action manipulate equals impel terms distance 800 equals force x 10/ 10/ 1080 equals magnetism so what you have to do is you have two one write this down one acquisition change in kinetic energy to find work three employ succeed and length to find force so let’s are you do one two kilograms this is a 2 kilogram gondola now I want to know in the distance is 100 meters what force was applied by the engine answer this and I’ m going to tell you that the answer is this is zero all the way up to 1600 ornaments and that means that the change in ke equals sixteen hundred that makes cultivate equals sixteen hundred effort equals force-out ages interval 1600 equals violence x 100 fractioned divided 160 equals magnetism BAM components Newton’s done that’s your advanced difficulty there’s a quiz on the website that you can take to practice everything I hint you do it before taking the test
