2142111 Statics – Class 3-1

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2142111 Statics – Class 3-1

Assignment Date: Friday 9 March 2012 Submission Date: In Class

Name ID No Complete FBDs of the bodies. All members are light unless stated otherwise.

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2142111 Statics – Class 3-2

Name ID No Complete FBDs of the bodies. All members are light unless stated otherwise.

Each member weights W.

Assume negligible weights for all members. The weight W of the bucket acts at G.

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Disassemble the structure.

1. The light BC is pinned at B and C. The light member AB is pinned at A and B.

2. The light system of 2 members ABCDE and FCG, 1 wheel D and a cable is assembled. The system is pinned at A and supported by a roller at G.

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2142111 Statics – Class 3-3

Disassemble the scissors and the rod. Note that friction is need at the scissors/rod contact points to maintain equilibrium of the rod.

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Complete FBDs of the bodies. Is it possible to exclude pins A and D from the lower diagrams?

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2142111 Statics – Class 3-4

Name ID No Complete FBDs of the bodies

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Complete FBDs of the bodies.

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2142111 Statics – Class 3-5

Name ID No Complete FBDs of the bodies. All members are light unless stated otherwise. Add important pins as necessary.

1. The rock cruncher

2. A system of the pliers and wire. The contacts between the wire and pliers are not frictionless.

3. A system of light members

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4. A cruncher clamped to a tabletop.

5. A shears with a twig

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2142111 Statics – Class 3-6

Name ID No Disassembling the bodies.

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2. Complete FBDs of the bodies. Then, determine the force in each member of the truss and state if the members are in tension or compression. Given P₁ = 10 kN, P₂ = 15 kN, a = 2 m, b = 4 m, c = 4 m.

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2142111 Statics – Class 3-7

Name ID No Disassembling the truss. Then, determine the zero-force members.

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Complete FBDs of the whole trusses and all joints. Then, determine the force in member BD.

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2142111 Statics – Class 3-8

Name ID No Identify zero forces members and draw FBD(s) to find loads on specified members.

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