1. READING QUIZ A wedge is a __________. A) truss B) frame C) machine D) beam

2. READING QUIZ Select the true statement from the following. A) A wedge is always self locking. B) Wedges are usually used to lift or lower weights. C) The weight of the wedge must always be considered in the analysis. D) A wedge is never in static equilibrium.

3. ATTENTION QUIZ A steel wedge is used to split a newly cut stump. The coefficient of static friction between the wedge and the stump is 0.25. Select the true statement about the wedge being popped out of the wood after being driven by the sledge. A) It can not happen. B) It can happen, if  is large. C) It can happen, if  is small. D) It will always come out. 

4. CONCEPT QUIZ A wedge is used to raise a block of weight W. If the coefficient of static friction between the wedge and the block and between the wedge and the horizontal surface is µ S, which of the following free body diagrams is correct for the wedge. N1N1 µsN1µsN1 P N2N2 µsN2µsN2 µsN1µsN1 µsN2µsN2 µsN2µsN2 µsN1µsN1 N1N1 N1N1 µsN2µsN2 N1N1 N2N2 N2N2 N2N2 µsN1µsN1 P P P Smooth rollers W P  C) B) D) A)

5. READING QUIZ In the equation T 2 = T 1 e µ ,  is ________. A) the angle of contact measure in degrees B) the angle of contact measure in radians C) the coefficient of static friction D) 2.718

6. The angle of contact for the cable in the free body diagram is ____________. A) 90 degrees B) 75 degrees C) 45 degrees D) 30 degrees ATTENTION QUIZ 45° 30° T1T1 T2T2

7. CONCEPT QUIZµ W P If a rope is used to lower a weight, select the true statement from the following. A) P = W e  B) W = P e  C) P = W e 180  D) W = P e 180 