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# HW3 - HOMEWORK PROBLEMS Week 3 Due Friday 30 September 1 In...

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HOMEWORK PROBLEMS Week 3: Due Friday 30 September 1. In Figure 1, the disk is homogeneous and has a mass of 5 kg and the bar AB can be regarded as weightless. If the coefficient of friction at C is 0.2, what is the maximum downward force P that can be applied without slip. 200 200 120 140 A B C P 30 o all dimensions in mm Figure 1 1

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2. A small rectangular block rests without slipping on a plane inclined at 30 o to the horizontal. A horizontal force P is now applied to the block in the direction perpendicular to the line of greatest slope, as shown in Figure 2, and is gradually increased from zero. It is observed that the block starts to slide when P = 0 . 2 W where W is the weight of the block. What is the coefficient of friction between the block and the plane? P o 30 Figure 2 2
3. Figure 3 shows a manual automotive jack. Rotation of the screw at D causes C to be pulled towards D and hence AB to move upwards against the vehicle weight P = 3 kN. The dimensions AB and EF are both L = 100 mm and the diagonal members AD , BC , CF , DE

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