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Why don’t we notice gravitational forces between objects on Earth
Gravitational force between objects r very small because grav constant is small
Force of 10power-9 is negligible compared to earth grav force acting on object
Far too weak to overcome opposing forces like friction between object and ground
Newtons Law of Gravitational
attractive forces between point masses
Proportional to masses
Inversely proportional to square of distance apart
Define grav field strength
Force per unit mass, vector
State and explain use for satellite travelling in orbit
GPS - several satellites needed to fix position on Earth
define gravitational potential at point in grav field
Work done per unit mass in moving mass from infinity to point