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Patterns of Motion and Equilibrium

Patterns of Motion and Equilibrium. Lecture 3 1.7 Equilibrium of Moving Objects 1.8 The Force of Friction 1.9 Speed and Velocity. 1.7 Equilibrium of Moving Things. Equilibrium is a state of no change Rest (not moving) is only one form of equilibrium

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Patterns of Motion and Equilibrium

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  1. Patterns of Motion and Equilibrium Lecture 3 1.7 Equilibrium of Moving Objects 1.8 The Force of Friction 1.9 Speed and Velocity

  2. 1.7 Equilibrium of Moving Things • Equilibrium is a state of no change • Rest (not moving) is only one form of equilibrium • An object moving at a constant speed in a straight line path is also in equilibrium. • Why??? • Because the sum of forces in both cases is zero • An object under the effect of one force can not be in equilibrium (sum of forces is not zero). • Push the table? Will it be in equilibrium • ? How many forces on it?

  3. 1.8 The Force of Friction • Friction occurs when one object rubs against something else. • It always acts in a direction to oppose motion. • It occurs for solids/liquids/gases. • The amount of friction between two surfaces depends on the kind of material and how much they are pressed together. • It is due to the tiny surface bumps and also to the stickiness of the atoms of the surfaces. • If the surface is inclines, friction is less

  4. 1.9 Speed and Velocity • Speed = distance covered / travel time (Galileo) • Units of speed • Instantaneous speed • Average speed • Velocity • circular motion • Km/h or m/s • Relative motion

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