When you open the fridge, warm air from outside rushes in. When you close the door, the warm air cools and contracts, creating a temporary vacuum that keeps the door stuck to the fridge. The vacuum effect lasts only seconds so you can soon open the door comfortably again.
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Air is compressible, water is not. When the tyre hits a bump or drops into a depression on the road, the impact pushes the air in the tyre into a smaller space. Thus the shock of the impact is absorbed by the cushion of air in the tyre, and is not passed on to the body of the car and consequently to the passengers.
Water cannot get compressed in this way. If a water-filled tyre were to hit a bump on the road, the water would retain its rigidity. As a result, the shock of impact would be passed on to the body of the car, jolting the passengers.
Secondly, water-filled tyres would increase the weight of the wheels and the vehicle would have to overcome greater rolling resistance. This would increase the load on the engine.
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If you attach a stone to a piece of string and whirl it around, you will feel the string tighten and the stone being pulled away. If the string is not strong, it will break and the stone will be hurled away in a straight line. This is the power of centrifugal force, the force exerted on a body in circular motion
When a cyclist takes a turn in a curved motion he is subjected to centrifugal force which pushes him to the edge of the curve. To maintain his balance he has to lean inwards while turning.
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When we get a smell, it is due to the brain, and not the nose. The nose collects scent molecules through odour receptors and information about these molecules passes on to the brain. The brain decodes this information and besides identifying the molecules, decides whether the smell is an indication of a threat or is harmless. If harmless, it ignores the smell after two or three breaths. So if you dab on perfume you'll get a whiff or two and then you won't smell it again, though others will.
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