Mechanical Energy: Does a Moving Block Have Potential Energy?

AI Thread Summary
A block with initial velocity on a flat horizontal surface does not possess potential energy, as it is in motion and all its energy is kinetic. Potential energy is only present if the block is attached to a system that can store energy, such as a spring. Gravitational potential energy is not applicable in this scenario since there is no elevation change. The consensus is that without an external system to store energy, the block retains only kinetic energy. Thus, a moving block on a flat surface has no potential energy.
KTiaam
Messages
53
Reaction score
1
I have a quick question:

does a block that has initial velocity from start have any potential energy on a flat surface (not on an angle or anything just a flat horizontal surface) ?

I was thinking no because it has no energy stored and all of it is kinetic, because it is in motion?
 
Physics news on Phys.org
KTiaam said:
I have a quick question:

does a block that has initial velocity from start have any potential energy on a flat surface (not on an angle or anything just a flat horizontal surface) ?

I was thinking no because it has no energy stored and all of it is kinetic, because it is in motion?

No, it doesn't. Unless it's attached to something else that can store potential energy, like a spring or something. Certainly not in gravitational.
 
Dick said:
No, it doesn't. Unless it's attached to something else that can store potential energy, like a spring or something. Certainly not in gravitational.
I agree and also unless its atached to somehig elastic then it would have elastic potential energy.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top