Physics class notes

Physics class notes - Physics I Mechanics(Class notes for...

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Unformatted text preview: Physics I Mechanics (Class notes for PH111) Massimiliano Bonamente Physics Department University of Alabama in Huntsville (version of September 7, 2009) Contents 1 Physical quantities, measurements and units of measure 1 1.1 Physical quantities, standards and measurements . . . . . . . . . . . . . . . . . . . . 1 1.2 Units of measure and prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Motion along a straight line 4 2.1 Position, displacement and distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Velocity and speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 Equations of motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4.1 Motion with uniform acceleration . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4.2 Motion with constant velocity . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.4.3 Other types of motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.5 Graphical interpretation of distance, velocity and acceleration . . . . . . . . . . . . . 10 3 Vectors 12 3.1 Cartesian coordinates and unit vectors . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2 Operations on vectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2.1 Vector addition and subtraction . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2.2 Vector multiplication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4 Motion in 2 and 3 dimensions 17 4.1 Position, displacement, velocity and acceleration . . . . . . . . . . . . . . . . . . . . 17 4.2 Path of a particle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3 Projectile motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.4 Uniform circular motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.5 Relative motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5 Dynamics of point masses and forces 27 5.1 The three laws of Newton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.2 Sum of forces and First Criterion for Equilibrium . . . . . . . . . . . . . . . . . . . . 29 5.3 Some particular forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.3.1 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.3.2 Normal reaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.3.3 The inclined plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.3.4 Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.3.5 Drag force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.3.6 Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Tension ....
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Physics class notes - Physics I Mechanics(Class notes for...

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