* Describe this state using the language of physics — equations; in particular, component analysis equations. Whenever you're given a pile of vectors and you need to combine them, components is the way to go — especially if you have no expectation of any special relationships among the vectors. The sign isn't going anywhere (it's not accelerating), therefore the three forces are in equilibrium. We used component analysis since it's the default approach.When an object is stationary and both the sum of all the forces and the sum of all the torques acting on it are equal to zero, it is said to be in static equilibrium.*

* Describe this state using the language of physics — equations; in particular, component analysis equations. Whenever you're given a pile of vectors and you need to combine them, components is the way to go — especially if you have no expectation of any special relationships among the vectors. The sign isn't going anywhere (it's not accelerating), therefore the three forces are in equilibrium. We used component analysis since it's the default approach.When an object is stationary and both the sum of all the forces and the sum of all the torques acting on it are equal to zero, it is said to be in static equilibrium.*

What is the contact force between the boxes, and what is the contact force between the bottom box and the floor?

(Answer: 98 N, 343 N) Problem # 3 The ball in problem # 1 is hung vertically from two strings. (Answer: 49 N) Problem # 4 A chain of mass 2 kg is resting on a table with half of its length hanging over the edge of the table. (Answer: 19.6 N) Problem # 5 A painting of mass 3 kg is hung off a wall with two strings attached to the top two corners of the painting.

It might be something flying through the air, sliding down a slope, or being pushed along the ground. Imagine something like a chair stationary on the ground, or a picture frame hanging on the wall.

Even though those two objects aren't moving, they still have forces acting on them.

In this practice problem, the vectors are rigged so that the alternate solution is easier than the default solution.

The graphical method for addition of vectors requires placing them head to tail.

On this page I put together a collection of statics problems to help you understand static equilibrium better.

The required equations and background reading to solve these problems is given on the equilibrium page.

Once you're tasked with solving a statics problem, how do you actually go about doing it?

There are several steps you can follow to make the problem as easy as possible for you. This might seem like a trivial step, but many mistakes are made by skimming through the problem and assuming you know what to do.

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