PHY 101 Chapter Notes - Chapter 7: Horsepower, Kinetic Energy, Dot Product
16 Nov 2016
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The greater the force, the greater the distance, the greater the work. Work: w= fd, when a constant force is in the direction of displacement (n*m, j) Scalar quantity; a large force over a small distance is the same as small force over a large distance. 1 j= 1 n*m= 1 (kg*m/s2)*m= 1 kg *m2/s2. Work: w= f/d when the distance is vertical. 1 j of work lifts a gallon of milk about an inch. W=0 if d=0 regardless of the size of the force. Force at an angle to the displacement. When f is at angle to the horizontal that is in the direction of motion, work is the component of force in the direction of the displacement times the magnitude of the displacement. When the angle is 90 (when force and displacement are at right angles) the work done by force f = 0.
