Why does a pilot not fall down when his aeroplane takes .a vertical loop?

Ripe fruits fall down when the tree is shaken. Why?

Why bodies fall down?

Why does a gun recoil when a bullet is fixed.

Why does a sheet of paper fall slower than one that is crumpled into a ball?

Why does an object float or sink when placed on the surface of water?

Why does a piece of red glass when heated and taken out glow with green light?

Why does the level of mercury fall in a capillary?

You may have seen in a circus a motorcyclist driving in vertical loops inside a ‘death-well’ (a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below: What is the minimum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is 25 m?

27 identical drops of water are falling down vertically in air with a terminal velocity 0.15 m//s . If they combine to from a single bigger drop, what will be its terminal velocity.

Why does velocity increase when water flowing in broader pipe enters a narrow pipe?