AST101H1 Chapter Notes - Chapter 4: Orbital Period, Hubble Space Telescope, Tidal Acceleration
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AST101H1 Full Course Notes
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Speed: how far it in a certain amount of time. Acceleration: when velocity is changing in any way (examples: speeding up, turning, slowing down) Galileo demonstrated that gravity accelerates all objects by the same amount, regardless of their mass. However, while a feather floats gently to the ground, while a rock plummets, air resistance causes this difference in acceleration. If you dropped a feather and a rock on the moon, where there is no air, both would fall at exactly the same time. Acceleration of gravity: the acceleration of a falling object is called the, abbreviated g. Acceleration of gravity on earth: about 10 m/s^2, which means an unsupported object"s downward velocity increases by 10m/s with each passing second (neglecting air resistance) Force always present: ex. on earth we always feel the force of gravity and there are always electromagnetic forces acting between atoms.