Astronomy 1021 Chapter 4: Notes
10 Dec 2015
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Speed tells us how far something will go in a certain amount of time. Velocity tells us both the speed and the direction. Acceleration tells us if the velocity is changing in any way. Doesn"t just mean increasing, can be decreasing as well: i. e. Acceleration of gravity acceleration of a falling object. Mass does not affect an objects acceleration (feather. Momentum product of mass and velocity (mass x and rock) velocity) Net force (overall) combination of all forces acting on an object at one time. Weight forces acting on an object (i. e. gravity) and the. Astronauts are in constant free-fall in space, therefore mass they are weightless. Newton"s laws of motion govern the motion of everything from our daily movements on earth to the movements of planets, stars and galaxies throughout the universe. First law in absence of a net force, an object will move with constant velocity. (an object at rest will stay at rest)
