WHY LOADS SEEM HEAVIER, CARRYING WITH HAND THAN HEAD?
This question requires little or no logic.
The answer to this question, students from other departments other than sciences,
might find it difficult to know. The facts remains that, even most science students or even learned persons,
know what the answer is all about?
But the only thing is, they may not be able to explain the real fact in the answer?
It's a term or a quantity that is often mentioned or used,
mostly in physics and chemistry
pressure[F/A].
All scientist, should know that pressure= F/A
Explanation:
It is known that pressure, is inversely proportional to area[surface area].
Which means, as the area[surface area] is increased[&uarr], the pressure reduces.
And as the area[surface area] is decreased[&darr], the pressure increases.
Pressure: is defined as a force or weight which presses against something else.
Scientifically pressure is defined as force per unit area[surface area].
Therefore, the area[surface area] of your hand can never be higher than the area[surface area] of your head.
In the case of a head, the part that touches the load is the surface area.
The load itself is a mass which acts against gravity to form weight [m*g].
In the case of a hand, the part that touches the load is the surface area.
The load itself is a mass which acts against gravity to form weight [m*g].
Comparison:
Let's assume that a man whose palms is touching just length=6cm and breadth=4cm part
of a bucket of mass 5kg. And a head of radius=3cm.
Find the pressure.
Solution:
A=L*B
Ap=Lp*Bp
Ap=6*4
Ap=24cm2
Ah=πr2
Ah=[22/7] * 32
Ah3.142*9
Ah=28.278cm2
Ah=28.3cm2
note:
Ap=surface area of palm, Ah=surface area of head
Lp=length of palm touching the bucket, Bp=breath of palm touching the bucket, rh=radius of the head touching the bucket.
Ap=surface area of palm, Ah=surface area of head
Lp=length of palm touching the bucket, Bp=breath of palm touching the bucket, rh=radius of the head touching the bucket.
remember this is an assumption because, heads may have their radius greater than 3cm.
So, since the Ahis greater than Ap, the pressure exerted on the man
while using is head will be lesser than the pressure exerted on the man while using is palm.
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