Mechanics - Forces and Motion
See Also
- [[Physics - Force and Newtons]]A
- [[Mechanics - Friction]]A
- [[Mechanics - Forces on Slopes]]A
- [[Mechanics - Forces]]A
Flashcards
2021-01-05
What is a force diagram?
A diagram showing all the forces acting on an object.
What should you draw whenever you have a problem involving forces in Mechanics?
A force diagram.
In $\hat{i}$ and $\hat{j}$ notation, what is the value of a resultant force for an object in equilibrium?
2021-02-02
If
\[\left(\begin{matrix} 2+p \\ 5+q \end{matrix}\right)\]is parallel to
\[\left(\begin{matrix} 1 \\ -2 \end{matrix}\right)\], what equation could you write in terms of a new variable $k$ to aid in solving??
\[\left(\begin{matrix} 2+p \\ 5+q \end{matrix}\right) = \left(\begin{matrix} k \\ -2k \end{matrix}\right)\]If
\[\left(\begin{matrix} 2+p \\ 5+q \end{matrix}\right) = \left(\begin{matrix} 1k \\ -2k \end{matrix}\right)\]is true, what two equations can you write??
\[2+p = k \\\\ 5+q = -2k\]#####
\[2+p = k \\ 5+q = -2k\]How could you rewrite this so it’s just in terms of $p$ and $q$??
\[-2(2 + p) = 5 + q\]2022-03-28
What’s the normal procedure for answering a ladder or hinge question?
- Take moments
- Resolve forces
How many components of reaction are there at a wall in a ladder question?
How many components of reaction are there at the hinge?
2022-05-01
Why is the reaction on a smooth surface always perpendicular to the surface?
As the surface is smooth, there is no friction and so the reaction is unchanged.
When reading a tricky mechanics question, what is it a good idea to do?
Circle all words like “smooth”, “rough”, “uniform”, etc.
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Is the reaction force necessarily the resultant force?
No, not if there is friction involved.
2022-05-15
If a string connecting two particles over a pulley is not actually light, what will be true?
The tensions will no longer be equal.