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# Lecture 28

ENGR-1100 Introduction to Engineering Analysis. Lecture 28. Today Lecture outline. Final exam review Machines Friction Distributed loads Composite area. D=320 lb 60 0 E=716 lb 75 0 F=540 lb 50.3 0. Class Assignment: Exercise set 7-105.

## Lecture 28

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### Presentation Transcript

1. Today Lecture outline • Final exam review • Machines • Friction • Distributed loads • Composite area

2. D=320 lb 600 E=716 lb 750 F=540 lb 50.30 Class Assignment: Exercise set 7-105 Determine all forces on member DEF of the frame shown in fig. P7-105. 140 lb/ft C B A 2 ft 75° 60° E D F 2 ft 3 ft

3. Example 5-46 Locate the centroid of the shaded area shown in each of the following figures.

4. A B Example 9-128 Blocks A and B of Fig. P9-128 have 20 - and 50 - kg masses, respectively. The static coefficients of friction between blocks A and B and between block B and the horizontal surface are 0.25. The static coefficient of friction between the rope and the fixed pegs is 0.20. Determine the force P required to initiate motion of block B. Pmin=414 N

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