A person hit harder when he falls on a concrete floor than when he falls on a heap of sand from the same height because on a hard surface he is brought to rest in a very short time, so greater force comes into action and he is hit harder. On the other hand, on a heap of sand, he is brought to rest in a longer time and so lesser force is called into play and he is hit slower.
It is based on the law of conservation of momentum that states that the sum of momenta of two objects before collision is equal to sum of momenta after the collision provided there is no external unbalanced force acting on them
This is a consequence of the impulse momentum principle.
When we bent our knees on landing, the time of impact increases and reduces the average force exerted during the entire process. This prevents the chance of damage to our body.
Impulse momentum principle states that the impulse of a force is equal to the change in momentum produced.
Impulse is measured as the product of force and time interval. So, when we stop ourselves, there is a fixed change in momentum. If we stop ourselves very fast, the time interval is less and the average force will be very large.
But, if we bent our knees during landing, the time involved in the proces of landing will be more and thus the average force will be less and hence the damage will also be les
Virus, unlike bacteria are dead until the enter the human body, when they transform and do damage. Because if this sugar actor stick of a virus, it makes it difficult to kill them, as it is very easy for it to hide and play dead. This is why it is easy to make antibiotics to kill bacteria, as bacteria do not show such behaviour, and do not change and replicate them selves, but the same cannot be done in the case of a virus, hence we cannot make antivirus medications as of right now
Chromosomes are the thread-like structure found in the nuclei of both animal and plant cells. They are made of protein and one molecule of deoxyribonucleic acid (DNA).
As the genetic material passes from parents to child, the chromosomes are responsible for containing the instructions that make the offspring unique while still carrying traits from the parent. In most organisms, one chromosome is inherited from the mother and the other is inherited from the father; to ensure that offspring carry traits from both parents. It's crucial that certain cells, like reproductive cells, have the correct number of chromosomes in order to function properly.
The structure of chromosomes helps ensure the DNA remains tightly wrapped around the proteins;otherwise, DNA molecules would be too large for the inside of the cells.
Organisms grow by undergoing cell division to produce new cells and replace older, wornout cells. During this cell division, DNA must remain intact and keep its even distributionthroughout the cells. Chromosomes are important to this process to ensure the DNA is accurately replicated.
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