Upside Down?
By Mangone
- 1982 reads
What is gravity?
Well, it’s an acceleration.
What is acceleration?
It is a means of exchanging energy for velocity.
What is velocity?
It is speed in a particular direction.
Okay.
Now if something falls we assume it gains energy but of course this is not true it loses energy.
A car that is accelerating on a straight is losing energy from the engine.
A car that accelerates off a cliff is losing energy from itself.
Imagine an ice cube on a sunny day.
It melts.
The liquid is eventually changed into water vapour and it goes up to join a cloud.
So, water given energy defies gravity.
When water vapour gives off some energy in the form of latent heat it turns back into water.
So clouds eventually give off enough energy to rain.
Catch some rain and stick it in the fridge and the rain will turn to ice.
So, we can see that you can exchange energy for structure.
Now, if you imagine a bouncing ball you can see that it exchanges some of its energy to fall but gets that energy back in the bounce.
Or. If you roll the ball down a V shaped incline which has a steep down and a less steep up the ball will never the less reach the same high even though it had to roll further on the way back up (if there were no friction).
In other words the speed of the ball is exchanged for enough energy to take the ball back to its initial height.
So, why does something that falls seem to gain energy?
Because it has increased its velocity in the downward direction and hence its lower mass and energy are not apparent!
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I recently looked up "mass" and found this definition - "The property of a body that causes it to have weight in a gravitational field."
It’s just NOT true!
Imagine you are an astronaut spacewalking, you’re in a gravitational field but you don’t have any weight do you? Isaac would have changed his mind about several things if he’d lived to see men in space.
The ironic thing is that men who we pay to think about space haven’t realised that Isaac was mistaken even though Albert tried his best to help them see it!
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