Astronomy 1021 Lecture Notes - Lecture 4: Circular Motion, List Of Association Football Teams To Have Won Four Or More Trophies In One Season, Net Force

• School: Western University
• Department: Astronomy
• Course: Astronomy 1021
• Professor: Robert Cockcroft

Document Summary

Vector (number and direction); displacement, velocity, acceleration. Tells us how far in a certain time (100km/hr) Change in velocity in a certain time (change is speed, direction, or both) Units: meters per sec per sec (m/s2) e. g. , 0 to 100 km/h in 4 seconds. Can feel acceleration (e. g. , train or plane), whereas you don"t feel constant speed. Falling apple; changed speed (it gets faster as it falls), same direction (always falls down), falling objects accelerate due to gravity. Ball on string; same speed (in uniform circular motion), changed direction (swings around in circle) At the earth"s surface: g 10 m/s2 an object is initially stationary. After 1 second, the object will be moving with a speed of 10 m/s, after 2 seconds it will be moving at 20 m/s, and so on, until it hits the ground. At the moon"s surface: g 1. 7 m/s2.