dot point (1 Viewer)

[clever angel]

i don't really know what to write for this dotpoint

explain how a change in gravitational potential energy is related to the work done?

 

[Xayma]

Work is the change in energy of an object.

Now to move an object in a gravitional field changes it gravitional potential energy (assuming its kinetic energy remains constant) therefore it's energy has changed and work has be done.

 

[nit]

You could possibly also relate it back to another dotpoint - ie gravitational potential energy is defined as the work done to move a point from a point an infinite distance away (ie unaffected by a body's gravitational field) to a point within that gravitational field.

 

[>monkey<]

u can explain it mathematically....thats wat i done

E=mgh (mg=force due to gravity)
E=Fh
from year 11m W=Fs
h=s since they are both distances
W=mgh
therefore there is a relationship between work done and height

hope it helps

 

[Helstar87]

-Ep will always be negative
-The biggest Ep will ever be is zero
-To lift an object against a gravitational field, a force must be applied to the object which is equal to or greater than the weight force of the object
-The work done by this applied force is equal to the force applied multiplied by the distance the object is lifted against the field
-The work done by the force is equal to the gravitational potential energy gained by the object (According to the law of conservation of energy)
- If the force is removed, then the stored Ep will be converted into Kinetic energy as the object falls with the g field

 

[(^o^)]

u can explain it mathematically....thats wat i done

E=mgh (mg=force due to gravity)
E=Fh
from year 11m W=Fs
h=s since they are both distances
W=mgh
therefore there is a relationship between work done and height

hope it helps

do u think that's gonna give you full marks by just writing that out?

if yes , i'll rmb it that way for sure, thanks heaps.

 

[xiao1985]

u can explain it mathematically....thats wat i done

E=mgh (mg=force due to gravity)
E=Fh
from year 11m W=Fs
h=s since they are both distances
W=mgh
therefore there is a relationship between work done and height

hope it helps

use rather gpe = - Gm1m2/r, not the mgh eqn... altho it also works... technically speakin it is nto entirely correct...

 

[(^o^)]

then what should we use ducky?!?!
I don't wanna memorise a bunch of sentences

 

[jamesy_1988]

you can have a look at what i wrote for my dot point at

www.geocities.com/jamesyscience_physics/ssyll/1.doc

hope that it helps

Jamesy