Gravitation Cheat Sheet (DRAFT) by Ayesha Talib

every object in the universe attracts every other object with a force which is propor­tional to the product of their masses and inversely propor­tional to the square of the distance b/w them.
6.673.10^-11Nm²kg^-2; Henry Cavendish using a sensitive balance.

force that binds us to earth; motion of moon around earth; motion of planets around sun; tides due to moon and sun.

accele­ration experi­enced by a freely falling object towards the centre of the earth. 9.8 m/s².
E^R>P^R = E^g<P^g

force acting on an object perpen­dicular to the surface.

thrust on unit area. SI unit: Pa or N/m²

tendency of fluids to exert upward force on an immersed object.
factors affecting buoyant force
volume of the object immersed in fluid
density of fluid
accele­ration due to gravity
temper­ature of fluid^{inversely propor­tional}

FLOAT:
upthrust > weight of object
^dfluid > ^dobject

SINK:
upthrust < weight of object
^dfluid < ^dobject

when a body is immersed fully or partially in a fluid, it experi­ences an upward force that is equal to the weight of the fluid displaced by it. used in designing submarines & ships, lactom­eters & hydrom­eters.