[Yahya A.Sharif (OP)]

Why Can a Human Lie on Their Abdomen on a Concrete Block Without Harm, While an Equivalent External Load Would Pose Significant Risk?

At first glance, this may appear to be a paradox in physics. A person can lie face-down on a concrete block with only their abdomen in contact and experience no harm. However, if the situation were reversed?where a concrete block of equal weight were placed directly on the person?s abdomen?it would likely result in serious injury. Given that the weight and contact area are effectively the same in both cases, why does the outcome differ?

The answer lies in the concept of biological leverage. In my Paper  The Theory of Biological Leverage: A New Discovery in Human and Animal Self-Movement, published in the SSRN Physiology eJournal, I observed that a person weighing 60 kg can rest on a concrete block with their abdomen as the primary point of contact without experiencing significant discomfort. However, applying a rigid external 60 kg load directly onto the abdomen would result in considerably higher pressure, leading to potential injury.

Although the magnitude of the weight is identical in both scenarios, the forces at play are not. When a person lies on their own abdomen, the body's internal musculoskeletal system attenuates the force through biological leverage mechanisms. In contrast, external loads do not benefit from this internal mechanical advantage and apply force directly to soft tissues.

This principle also explains the long-term functionality of human joints, including the spine. The body is structurally adapted to support internal loads like the trunk's weight through evolved leverage systems. However, when external loads are applied, the stress imposed on joints and tissues can surpass safe thresholds, resulting in damage over time.

[Bored chemist]

Q Can a mass be lifted with force less than its weight ?
A No

Looking at the last posting there is some good news.
It seems that the poster does not realise that a prone human can easily support the weight of another.
So the underlying problem will be saved in a generation or two.

[Yahya A.Sharif (OP)]

Q Can a mass be lifted with force less than its weight ?
A No

Yes, a mass can be lifted with less force than its weight using leverage. In classical mechanics, levers with mechanical advantage make this possible. I've  introduced the concept of Biological Leverage, where the human body lifts or supports itself using internal forces much smaller than its weight. For example, a 63.4 kg person lifted their body using just 32 kgf of foot force. So both in physics and biology, lifting with less force is achievable.

Looking at the last posting there is some good news.
It seems that the poster does not realise that a prone human can easily support the weight of another.

Biological leverage is about how body weight applies less pressure on internal structures, and how that reduced effective weight can be lifted using smaller muscle forces. In my experiment, I focused on comparing the effects of applying an equivalent weight in reverse i.e., placing a load on the abdomen instead of the body supporting itself.
As for a prone human supporting the weight of another person, that is a separate discussion, but it can still be analyzed within the biological leverage framework.

So the underlying problem will be saved in a generation or two.

My aim is not to leave this problem for the future. I am studying it now through experiments and a new idea called Biological Leverage. At least, I have discovered and explained a problem that was not clearly known before. I believe it is important to talk about it now, not wait for another generation.

[Bored chemist]

Q Can a mass be lifted with force less than its weight ?
A No

Yes, a mass can be lifted with less force than its weight using leverage.

No.
The force applied to the mass must exceed its weight.
Who you produce that force (e.g. using a lever) is irrelevant.

[Bored chemist]

. I've  introduced the concept of Biological Leverage, where the human body lifts or supports itself using internal forces much smaller than its weight. For example, a 63.4 kg person lifted their body using just 32 kgf of foot force. So both in physics and biology, lifting with less force is achievable.


. I've  introduced the concept of Biological Leverage,

Biological leverage is about how body weight applies less pressure on internal structures.

You have made up nonsense to try to explain something that only you think needs explaining.
The rest of us know it simply isn't real.

[Yahya A.Sharif (OP)]

. I've  introduced the concept of Biological Leverage, where the human body lifts or supports itself using internal forces much smaller than its weight. For example, a 63.4 kg person lifted their body using just 32 kgf of foot force. So both in physics and biology, lifting with less force is achievable.


. I've  introduced the concept of Biological Leverage,

Biological leverage is about how body weight applies less pressure on internal structures.

You have made up nonsense to try to explain something that only you think needs explaining.

That you refer to as a problem- one that requires scientific solution.

So the underlying problem will be saved in a generation or two.

[Yahya A.Sharif (OP)]

The rest of us know it simply isn't real.

Not true.

[alancalverd]

Since weight is defined as the force required to lift a mass in a gravitational field, the question is an oxymoron.

[Yahya A.Sharif (OP)]

Since weight is defined as the force required to lift a mass in a gravitational field, the question is an oxymoron.

In engineering as well as  biology there is a significant distinction between forces greater than weight applied directly and those less than weight applied through a lever. So physically the force needs to be greater than weight if it is applied directly can the force accelerate a mass against gravity while it is less than the weight? yes via a lever.

[alancalverd]

But the force that actually lifts the mass is the directly applied force, whatever its controlled source, so the answer to the question is no.

[Yahya A.Sharif (OP)]

So the underlying problem will be saved in a generation or two.

By a British scientist??

[Bored chemist]

It seems that the poster does not realise that a prone human can easily support the weight of another.
So the underlying problem will be saved in a generation or two.

The problem will die out.
One common situation where it is clear that a prone human can support the weight of another is during procreation.

Many British scientists are already aware of this.
It seems that you are not.
And thus you are unlikely to bequeath your absurd viewpoint.
This will solve teh problem

[Yahya A.Sharif (OP)]

The problem will die out.

Highly likely.

One common situation where it is clear that a prone human can support the weight of another is during procreation.

Yes, this makes the entire idea wrong.

Many British scientists are already aware of this.
It seems that you are not.

It seems so.

And thus you are unlikely to bequeath your absurd viewpoint.

Totally absurd.

[Yahya A.Sharif (OP)]

But the force that actually lifts the mass is the directly applied force, whatever its controlled source, so the answer to the question is no.

Yes, the answer is no.

[Yahya A.Sharif (OP)]

You asked this question 5 years ago in this thread:
Can a mass be lifted with force less than its weight ?
The answer you received then was 'no', the answer is still 'no' and 5 years from now the answer will still be 'no'.

I finally knew that I was very stupid.

[Yahya A.Sharif (OP)]

It is still wrong.

Will always be wrong.

[Yahya A.Sharif (OP)]

Many British scientists are already aware of this.
It seems that you are not.

Science is mainly British.

[Yahya A.Sharif (OP)]

This is a basic biomechanics and Physiology theory but it is still wrong.

[Yahya A.Sharif (OP)]

Why Can a Human Lie on Their Abdomen on a Concrete Block Without Harm, While an Equivalent External Load Would Pose Significant Risk?

At first glance, this may appear to be a paradox in physics. A person can lie face-down on a concrete block with only their abdomen in contact and experience no harm. However, if the situation were reversed?where a concrete block of equal weight were placed directly on the person?s abdomen?it would likely result in serious injury. Given that the weight and contact area are effectively the same in both cases, why does the outcome differ?

The answer lies in the concept of biological leverage. In my Paper  The Theory of Biological Leverage: A New Discovery in Human and Animal Self-Movement, published in the SSRN Physiology eJournal, I observed that a person weighing 60 kg can rest on a concrete block with their abdomen as the primary point of contact without experiencing significant discomfort. However, applying a rigid external 60 kg load directly onto the abdomen would result in considerably higher pressure, leading to potential injury.

Although the magnitude of the weight is identical in both scenarios, the forces at play are not. When a person lies on their own abdomen, the body's internal musculoskeletal system attenuates the force through biological leverage mechanisms. In contrast, external loads do not benefit from this internal mechanical advantage and apply force directly to soft tissues.

This principle also explains the long-term functionality of human joints, including the spine. The body is structurally adapted to support internal loads like the trunk's weight through evolved leverage systems. However, when external loads are applied, the stress imposed on joints and tissues can surpass safe thresholds, resulting in damage over time.

Can someone explain what the flaws in this to be a new concept and a new theory?

[Yahya A.Sharif (OP)]

I can see how it is obviously wrong: I could lie on my stomach on a concrecte block for a minute without pain with my weight 70 kg, however the opposite is also true I can put a rock of 70 kg on my stomach with the same area of contact without any damage or pain. Obviously wrong concept.
I thought I discovered basic biomechanics, how stupid I am.
Thank you
Let this idea die out who cares.