Questions tagged [statics]

Analysis of a system of bodies where all forces are in balance and there is no motion relative to a chosen reference frame.

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Distribution of normal force on a book resting on the edge of a table

Assume a uniform book is resting on a table. The book has length $1$. But not the entire book is resting on the table, a bit $\alpha$ is sticking out of the table. Obviously, due to experience, we ...
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Projection of force [closed]

So to find the projection along the cable in question 124 we used CA (not AC). Why? I thought that we always start from the end point of the Force, which is AC and not CA.
141 views

How to deduce the following equilibrium equation?

I have seen the following free-body diagram in an engineering paper, J. Compos. Constr. 9, 388 (2005) (e-print): As it is mentioned in the paper $f_j$ is the stress in the FRP layer (which acts ...
190 views

Forces on Bifolding Door with horizontal hinge

I'm a programmer who's been put in charge of some motor control problems and I need your help, so please forgive me if the question is silly. The problem in question (see inserted picture) is ...
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How to determine tipping point for a single pedestal dining table?

How to determine minimum weight to tip over a single pedestal dining table? We have a client who wants a rectangular table, 72" L x 42" W, and the MDF top will weigh approximately 100 lbs and the ...
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Determining tension in a rope between two masses using only force arrows (i.e. no calculations)

The situation sketched above is often used for problems involving tension. Let's say we know the masses $m$ and want to determine the tension $T$ in the rope (no friction, massless rope). Since ...
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Static friction free body diagram on a flat plane

Do you include static friction on a free body diagram for a static box on a flat surface? Or do you just include Force of gravity and Normal force? We know when the box is moving there is Frictional ...
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Distribution of weight of an inclined object

We have a rod, 1m long and negligible height compared to the length, mass 10Kg uniformly distributed (center of gravity in the center). It is tilted theta degrees to the horizontal, and rests on two ...
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Why are arc bridges stronger than flat bridges?

To keep the question brief: in bridge design, why is the arc structure favoured compared to a simple flat one? In other words, how does the curved platform alter the force decomposition of the load ...
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Static geometry problem [closed]

Why is the force Nb has triangle of height a and base 2r. Why is not height 2r and base a?
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direction of resultant moment about axis using scalar and right hand grip rule? [closed]

From the picture posted, this question is taken from my solution manual. I understand that using vector method of finding the resultant moment. I also know when we use scalar with right grip rule to ...