10-W: Simplification of Force-Moment Systems F4-19. Replace the loading system shown by a single resultant force acting at A and a single couple moment acting at A. State your answer as a resultant force magnitude and angle from the + x-axis, and as a moment magnitude with a CW/CCW designation. 900 N \30° 300 N 300 N m

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Chapter2: Loads On Structures
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ENGR 234: Statics
10-W: Simplification of Force-Moment Systems
F4-19.
Replace the loading system shown by a single resultant force acting at A and a single couple moment
acting at A. State your answer as a resultant force magnitude and angle from the + x-axis, and as a
moment magnitude with a CW/CCW designation.
900 N\30°
300 N
300N•M
A
0.75 m
0.75 m
0.75 m
0.75 m
Solution Strategy:
1. The planar nature of the problem lends itself to Scalar Analysis.
2. Resolve the 900 N force into its x- and y-components.
3. Using Scalar Analysis, compute the moments due to the forces: Use the Principle of Moments
for the 900 force (i.e. use its components). The 300 N force already has an easily identifiable
perpendicular distance to A. Keep track of the senses of these moments.
4. Determine the sense of the 300 N m couple, and then add this to the moments found in step 3
to find a single resultant moment at A.
5. Sum the forces in x and y and then combine them into a single resultant force in the magnitude-
angle (polar) form required.
Transcribed Image Text:ENGR 234: Statics 10-W: Simplification of Force-Moment Systems F4-19. Replace the loading system shown by a single resultant force acting at A and a single couple moment acting at A. State your answer as a resultant force magnitude and angle from the + x-axis, and as a moment magnitude with a CW/CCW designation. 900 N\30° 300 N 300N•M A 0.75 m 0.75 m 0.75 m 0.75 m Solution Strategy: 1. The planar nature of the problem lends itself to Scalar Analysis. 2. Resolve the 900 N force into its x- and y-components. 3. Using Scalar Analysis, compute the moments due to the forces: Use the Principle of Moments for the 900 force (i.e. use its components). The 300 N force already has an easily identifiable perpendicular distance to A. Keep track of the senses of these moments. 4. Determine the sense of the 300 N m couple, and then add this to the moments found in step 3 to find a single resultant moment at A. 5. Sum the forces in x and y and then combine them into a single resultant force in the magnitude- angle (polar) form required.
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