advertisement

Notes: A really fast Chapter 5 (Circular Motion) Important points 1. An object moving in a circle of radius r with constant speed is said to be in uniform circular motion. radial acceleration is equal to the velocity squared divided by the radius of the circle 2. A force is need to keep an object revolving in a circle and the direction of this force is toward the center of the circle 3. Newton’s law of universal gravitation states that every object in the universe attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them 4. Keplar’s Laws a. Keplar’s first law: The path of each planet around the sun is an ellipse with the sum at one focus b. 2nd law: each planet moves so that the planet sweeps out in equal areas in equal periods of time c. The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their mean distances from the sun p2 = d3