AST101H1 Lecture Notes - Tidal Force, Lunar Phase, Bicycle Tire

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Michael Reid

Document Summary

Assignment 5: earth has two tidal bulges at all times. Therefore, the parts of earth that are closer to the moon feel a stronger gravitational attraction to the moon, and the parts of earth that are farther away feel a weaker gravitational attraction to the moon. Why does the moon play a greater role in causing tides than the sun: the sun exerts a stronger gravitational force on earth, which is why earth orbits the. However, tides are caused by the variation in the gravitational attraction across earth. Even though the gravitational attraction between earth and the moon is smaller than the attraction between earth and the sun, the moon"s much closer distance makes this attraction vary more across earth. Fusion requires bringing two positively charged nuclei so close together that the strong nuclear force can hold them against the electromagnetic repulsion of their positive charges.