# Does getting sucked up require more energy then getting pushed away?

## Main Question or Discussion Point

For instance The object has same mass in both cases.
And the force of getting sucked and pushed away is also the same.

Does getting sucked up require more energy then getting pushed away?

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ZapperZ
Staff Emeritus
For instance The object has same mass in both cases.
And the force of getting sucked and pushed away is also the same.

Does getting sucked up require more energy then getting pushed away?
Why don't you test this with an idealized adiabatic piston and an ideal gas trapped inside the piston? Is the work done in compressing the piston by an amount equal or different than the work done by the gas in expanding back to the piston's original position?

Zz.

Why don't you test this with an idealized adiabatic piston and an ideal gas trapped inside the piston? Is the work done in compressing the piston by an amount equal or different than the work done by the gas in expanding back to the piston's original position?

Zz.
I don't have one.

ZapperZ
Staff Emeritus
I don't have one.
No one has an "idealized piston". It wasn't meant to be an experiment. It was meant for you to calculate!

Zz.

Nugatory
Mentor
For instance The object has same mass in both cases.
And the force of getting sucked and pushed away is also the same.

Does getting sucked up require more energy then getting pushed away?
The required energy will depend on the efficiency of the device doing the sucking/pulling; if they were perfectly efficient there would be no difference. In practical applications pushing is often more efficient, but this is by no means universally true.

sophiecentaur
Gold Member
No one has asked you the actual context of this question. A sketch of the sort of arrangement you are considering would help. I have a feeling you may not be talking in terms of pistons and cylinders.

256bits
Gold Member
For instance The object has same mass in both cases.
And the force of getting sucked and pushed away is also the same.

Does getting sucked up require more energy then getting pushed away?
If "sucking up" you mean in the vertical direction upwards; and by being pushing away you could mean in any direction; then there would be a difference.

By going upwards, the mass will have an increase in gravitational potential energy. You will have to supply this energy.
By pushing away, say in the horizontal direction, the gravitational potential energy stays the same. If on a surface, friction due to sliding will require an energy expenditure.

Pushing away in any other direction from the horizontal entails a change in potential energy. This could help you in if the final position is below the initial, or add to the energy expenditure if above the initial position.

You may have to clarify your question.

sophiecentaur