Physics 209A Sonoma State University Name PreLab 5: Static Equilibrium 1. Static

Question

Physics 209A Sonoma State University Name PreLab 5: Static Equilibrium 1. Static equilibrium means that all forces on an object balance (or cancel) so that the object does not move. Given the two forces, Fi and F2, acting on the object below, draw an arrow showing the approximate magnitude and direction of the balancing force, Fa. F. F. 30 30 2. If F, is equal to 4.0 newtons, what are the horizontal and vertical components of components of Fi? Be careful with +/-signs. And what are the components of F2 if it is also 4.0 newtons? 3. If the three forces, F1, F2, and Fs, are in static equilibrium then not only do the three forces cancel each other but the horizontal components of all three add up to zero newtons, as do the vertical components of all three. So, what are the horizontal and vertical components of F3? 4. Do the components of Fa you just calculated match the diagram that you drew for question 1? What is the total magnitude of F3? IF.1

Explanation / Answer

F1x = - 4 cos30 = - 3.5 N

F1y = 4 sin30 = 2 N

F2x = 4 cos30 = 3.5 N

F2y = 4 sin30 = 2 N

3. F1 + F2 + F3 = 0

so F1x + F2x + F3x = 0

F3x = 0 .......Ans

F1y + F2y + F3y = 0

F3y = - 4 N ........Ans

4. magnitude = sqrt(F3x^2 + F3y^2) = 4 N

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