Free Fall - Science Theater 07

What does it feel like to float in outer space? How do satellites orbit the Earth? These mysteries, and more, are explained in this short video about gravity, orbits, and free fall.

Category:

Entertainment

Tags:

• science
• physics
• education
• demo
• freefall
• gravity
• orbit
• Free Fall
• Theatre
• Theater
• Funny

[cystum]

Great video,

What's the formula for this? How fast the satellite needs to travel to miss the earth?

[sciencetheater]

@cystum it depends on how far above the earth it is orbiting. You put centripetal force equal to gravitational force and solve for speed...

[kungfumaster4444]

do you know why objects accelerate?

[sciencetheater]

@kungfumaster4444 You mean accelerate due to gravity? They are pulled together by a fundamental force of the universe. Explaining how gravity works would be trickier...

In more detail: gravity supplies a force, and a force acting on a mass causes it to accelerate.

[addieroxrev09]

how i wish teachers at school could explain physics in sucha fun way !!!

[Bouncert]

thank u sir...very useful

[TheGrinningSkull]

@kungfumaster4444 In the end, it comes down to mass. Mass feels and also causes a gravitational force :)

Gravity IS a force :) Just like there is electric and magnetic :)

So there are 3 fundamental field forces that cause acceleration and those are gravity, electric and magnetic.

Gravity caused by mass, electric caused by charge and magnetic caused by moving charge :)

[TheGrinningSkull]

@sciencetheater In the end, it comes down to mass. Mass feels and also causes a gravitational force :)

Gravity IS a force :) Just like there is electric and magnetic :)

[iamcoolrght1]

cool vidi man i wish our teashers could learn frm u

[bladdeins]

not the thing I was searching for but I still learned SO much! Great explained ! I really understood everything and learned a lot, and had funt at the same time! thank you!

[richragan2]

@Lamboragon I think you're right that one will understand and can work with physics better with sufficient calculus. However, physics is usually what excites young minds and the basic principles to work with can easily be explained without calculus. To take your point to the extreme, should you respond to a child, who asks why a ball falls toward the earth, that you'll tell them the answer after they've taken calculus?

[sciencetheater]

@Lamboragon A force is a push or a pull, and most HS physics teachers introduce vectors to students in order to deal with forces correctly. However, forces can be discussed even earlier if everything is kept in one dimension.

[sciencetheater]

@Lamboragon There is a lot of physics that can be learned without calculus. To understand the underlying reasons why things are the way they are.... Calculus makes it so much easier. However, basic principles can be understood without calculus. (You can learn to use the equations, you just don't get to see where they come from...)

[navdanji]

i want an idea about george darwin. Please post

[265650]

40,075 Km is the perimeter of earth.

So the min speed should be 40,075 Km/sec.

[XxBrian88xX]

I love how you use Einstein to introduce Newtonian gravity... just sayin