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# F4 ch2.9

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### F4 ch2.9

1. 1. 2.9: FORCES IN EQUILIBRIUM<br />
2. 2. Forces in Equilibrium <br />When an object is in equilibrium, the resultant force acting on it is zero. <br />The object will either be <br />1. at rest <br />2. move with constant velocity. <br />
3. 3. RESULTANT FORCE<br />A single force that represents the combined effect of two of more forces in magnitude and direction. <br />
4. 4. Examples( Label the forces acted on the objects) <br />
5. 5. Addition of Forces <br />Resultant force, <br />F = ____ + ____ <br />Resultant force, <br />F = ____ + ____ <br />
6. 6.
7. 7. STEP 1 <br />Using ruler and protractor, draw the two forces F1 and F2 from a point. <br />
8. 8. STEP 2 <br />Complete the parallelogram <br />
9. 9. STEP 3<br />Draw the diagonal of the parallelogram. The diagonal represent the resultant force, F in magnitude and direction.<br />
10. 10. Resolution of Forces <br />A force F can be resolved into components which are perpendicular to each other: <br />(a) horizontal component , FX <br />(b) vertical component, FY<br />
11. 11. Resolution of Forces <br />Component of weight parallel to the plane <br /> = mg sin θ <br />Component of weight normal to the plane <br /> = mg cosθ <br />Fx= F cosθ <br />Fy= F sin θ <br />