# Week7a - Gravity Week Topics covered Section in Textbook Ch...

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Gravity Topics covered Week Topics: Rotations and Matter Section in Textbook 6 Static Equilibrium Rotation, Moment of Inertia Conservation of Angular Momentum Ch. 11 : 1-3 Ch. 9 : 1-5 Ch. 10 : 1-7 7 Gravity Fluids including surface tension Ch. 12 : 1-6 Ch. 14 : 1-6 8 Elasticity Thermal Expansion Oscillations Ch. 11 : 4-5 Ch. 17 : 4 Ch. 13 : 1-6 2 Learning Goals Gravity • Calculate gravitational forces for any two bodies • Relate weight to gravitational force • Use and interpret gravitational potential energy • Relate speed, orbital period and mechanical energy of a satellite in orbit • Be aware of the laws that govern the motion of the planets Fluids • Know the meaning of density of a material and average density of a body • Know the meaning of pressure in a fluid • Calculate buoyant force of a fluid on a body immersed init • Laminar and turbulent fluid flow • Application of Bernoulli’s equation • Knowledge of cohesion and adhesion • Familiar with viscosity, surface tension and the Venturi effect 3 Experiments • Rotational Dynamics • Young’s Modulus • Spring Constant • Compound Pendulum • Thermal Expansion • Reynolds Number • Viscosity • Surface Tension 4

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Demonstrations W EE K Topics: MATERIALS . LECTURE DEMONSTRATION 6 Static Equilibrium, Rotation, Conservation of Angular Momentum, Gravity. Calculating the Moment of Inertia & the Gravitational Field. Conservation of Angular Momentum - Person Spinning Gyroscopic Precession Moment of Inertia - Rolling Objects Race Torque – Rolling Yo-Yo Static Equilibrium - Stacking Wood Lengths 7 Elasticity, Fluids. Fluid examples including surface tension. Magdeburg Hemispheres/Dis ks 8 Thermal Expansion, Oscillations. Examples and Forced Oscillations. Period of a Simple Pendulum Modes of Oscillation - Coupled Pendula 5 Tutorials 6 Newtons Law of Gravity where F 12 is the force exerted by m 1 on m 2 G is the universal gravitational constant. r 12 is the distance from m 1 to m 2 is the unit vector from m 1 to m 2 The mass of the Moon is 1/81 of the mass of the Earth. Compared to the gravitational force that the Earth exerts on the Moon, the gravitational force that the Moon exerts on the Earth is (a) 812 = 6561 times greater (b) 81 times greater (c) equally strong (d) 1/81 as great (e) (1/81) 2 = 1/6561 as great www.votapedia.com (a)02 81161820 (b)02 81161821 (c)02 81161822 (d)02 81161823 (e)02 81161824
Kepler’s Laws Deduced by Johannes Kepler from observations by Tycho Brahe in the late 1500’s 1. All planets move in elliptical orbits with the sun at one focus. 2. A line joining any planet to the sun sweeps out equal areas in equal times. 3. The square of the period of any planet is proportional to the cube of the planet’s mean distance from the sun. 1. All planets move in elliptical orbits with the sun at one focus.

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## This note was uploaded on 08/20/2010 for the course PHYS 141 taught by Professor Xxx during the One '09 term at University of Wollongong, Australia.

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Week7a - Gravity Week Topics covered Section in Textbook Ch...

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