(a) The homogeneous, 250 kg mass triangular plate shown in Fig. Q1(a) is supported by pin A and a roller at C. Angle B is 90°. 0.6m 30 Fig.Q1(a): Triangular Plate (i) Draw the Free Body Diagram (FBD) for the plate. (ii) Determine the magnitudes of the reaction forces at A and C. Note: The centre of mass of a triangle is at 1/3 of its height as measured from the base.

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.