ASTR 1110 book summary - ch.4.1

# ASTR 1110 book summary - ch.4.1 - Astronomy Book Notes 4.1...

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Astronomy – Book Notes 4.1 Describing Motion: Examples from Daily Life - Speed, Velocity, and Acceleration - Speed: The rate at which an object moves. Its units are distance divided by time, such as m/s or km/hr. o Says how far something will go in a certain amount of time o Ex: 100 km/hr (60mi/ hr) - Velocity: o Tells us both speed and direction o Ex: 100 km/hr due north - Acceleration: The rate at which an object’s velocity changes. Its standard units are m/s squared. o Tells if its velocity is changing in any way (in speed, direction, or both) o Slowing down or turning is also accelerating o Slowing down = negative acceleration - The Acceleration of Gravity - Objects accelerate as they fall - Gravity accelerates all objects by the same amount, regardless of their mass. - Acceleration of gravity: The acceleration of a falling object. On Earth, the acceleration of gravity, designated by g , is 9.8 m/s squared. o

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ASTR 1110 book summary - ch.4.1 - Astronomy Book Notes 4.1...

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