_WCLN - Physics - Forces 2 - Contact & Non-Contact скачать в хорошем качестве

_WCLN - Physics - Forces 2 - Contact & Non-Contact

This video follows Forces 1. This tutorial is about the different types of forces, contact and non-contact. It includes push, pull, applied, friction, gravity, and magnetic forces. #forces #contact #non-contact #pull #push #gravity 0:00in this tutorial we'll continue our discussion about forces will talk about 0:07two categories of forces contact forces and non-contact forces contact forces 0:16include applied forces like when you pushed or pulled on an object when you 0:23pushed on an object you are definitely contacting the object when you pull on 0:30an object you're often in directly contacting the object that is you are 0:35contacting the roper handle which contacts the object when you kick a 0:41soccer ball you are contacting the soccer ball during the kick 0:46so it is also a contact force frictional forces are also contact forces when you 0:55drag an object over the floor the floor applies the friction force on the bottom 1:00of the object where the object contacts the floor when a POC is sliding along 1:08the ice the ice provides the friction force on the puck it's a small friction 1:13force but it's definitely a contact for us as the ice contacts the bottom of the 1:20puck non-contact forces on the other hand do not require contact to cause a 1:28force they have an invisible force field or field of influence 1:34let's look at a couple examples of non-contact forces what happens when you 1:41jump up 1:43well something pulls you back down and that's the force of gravity and you 1:49can't see it but you definitely feel it every time you trip 1:54gravity is quite an amazing force as it keeps our planets in orbit and also 1:59keeps water in your glass a skydiver jumping out of a plane has no contact 2:06with the earth but they are definitely being pulled towards the center of the 2:10earth another name for the 2:13force of gravity is wait how much you weigh is the same as how hard the earth 2:20is pulling you down gravity is definitely a non-contact force and then 2:27another non contact force is magnetism if you bring magnets close together they 2:34move each other either avoiding each other or jumping together depending on 2:40the poles no contact was required to make the force appear in fact one of 2:46Albert Einstein's first interests in science was the mysterious non-contact 2:51force that he observed with magnets in this tutorial we looked at forces into 2:58categories contact forces and non-contact forces contact forces 3:06require contact with the object while non-contact forces can exert force 3:12without contact both cause changes in motion by either pushing or pulling 3:20examples we looked at for contact forces include applied forces and frictional 3:28forces examples of non-contact forces included gravitational force and 3:35magnetic force