Gravitational Potential and Kinetic Energy | GCSE Physics | Doodle Science

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Gravitational potential energy is the energy stored in an object as the result of its vertical position or height. The energy is stored as the result of the gravitational attraction of the Earth and the object. The gravitational potential energy of the massive ball of a demolition machine is dependent on two variables - the mass of the ball and the height to which it is raised. These variables are related and can be expressed by the following equation: Ep = m x g x h. Where Ep is the Gravitational potential energy in Joules. M is the mass in kilograms. G is the gravitational field strength in Newton's per kilogram and H is the change in height in metres.

To determine the gravitational potential energy of an object, a zero height position must first be arbitrarily assigned. Typically, the ground is considered to be a position of zero height. But this is merely an arbitrarily assigned position that most people agree upon. So if someone were to go to the top of Mount Everest, they would have a higher gravitational potential energy than if someone were to stay on the beach. If he were 85kg, then his gravitational energy would be the height of Mount Everest, which is 8,848m times by 85 times by 9.8N/kg which is the pull of gravity from the earth. So the gravitational potential energy of this guy is 7 370 384 Joules.

But this energy is just potential, if he were to jump off the peak of Mount Everest then most of the potential energy will be transferred to kinetic energy. We can calculate his kinetic energy with the equation: Ek = ½ × mass × velocity2. If he was travelling at a velocity of 54m/s; then his Kinetic energy would be 123 930 Joules. But some of it will be lost as heat as well. This is why a pendulum on a clock eventually stops because a small percentage of energy is being lost as heat with every tick.

[namelessking]

Im glad that you are slowly getting more and more difficult with the equations/formulas. It is just like how they do in a real class. Keep up the great vids!

[MyfellowEgyptians]

Imagine having to do GCSEs and not just getting predicted grades

[annahenry]

After 2.30minz I actually understand!! the whole of an hour lesson that I just sat through I really didn't get!!! Keep up the good work!!

[magician]

I swear, you are creating videos as we are learning the material! If you are doing this on purpose, thi is very useful and thank you! If not, I am just extremely lucky! 

[erfanaryan]

this video helped a lot so thanks! and keep up the good work

[velvetai]

i have a science test tomorrow and this vid helped me to understand kinetic energy thank you for making this vid :)

[DansTrailShreds]

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[OlafGodredsson]

So how fast would the man fall from Everest? (Negating air resistance) And what would that sort of impact do to the earth? :)

[Jason-hppu]

oh my good you deserve much mOre subscribers so

[janaronne]

As someone sensitive to sounds, the background music is very annoying...:( Otherwise, great explanation!

[jsalnut]

The subs are a little off. When the narrator says "squared" the subs said "squirt."

[DoubleSwords]

"Hello, and welcome to the History of Rome..."

[grahamflowers]

There is no kinetic energy in a moving mass there is force Mv squared kinetic energy is the energy of consistent work from a consistent force regards Graham Flowers

[ordieth]

I really enjoy the content, but this video made me cringe when you didn't write down the units in your equations.

[Lozza-ntpu]

If u were to jump off mt Everest u would die

[sianjadeja]

this is incorrect when travelling under gravity you only go 9.8 m/s