AST201H1 Lecture 4: AST201 - lecture 4

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Bryan Gaensler, C. Barth Netterfield, Ilana MacDonald

Document Summary

Objects will move with a constant speed and direction unless acted on by an external. You feel gravity every day, every other force you feel (wind, pushing keyboards etc. ) is electromagnetism. There are two more that matter but don"t feel every day (strong nuclear force holding atoms together) Generated by the mass of the earth, if it were smaller it would be less, and if earth was larger in size then the gravitational force would be stronger. Infinite = everything is being pulled by other objects. Though the effect is not large since the objects are small in mass. Distant stars in the galaxy also affect each other in gravity. The ball would stop accelerating once it leaves your hand. If one body exerts a force on another, the other body will exert a force of equal strength but opposite direction. The baseball has to exert a force on you.