Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Smartphone sensors and video analysis: two allies in the Physics
  laboratory battle field   Recently, two technologies: video analysis and mobile device sensors have
considerable impacted Physics teaching. However, in general, these techniques
are usually used independently. Here, we focus on a less-explored feature: the
possibility of using supplementary video analysis and smartphone (or other
mobile devices) sensors. First, we review some experiments reported in the
literature using both tools. Next, we present an experiment specially suited to
compare both resources and discuss in detail some typical results. We found
that, as a rule, video analysis provides distances or angular variables, while
sensors supplies velocity or acceleration (either linear or angular). The
numerical differentiation of higher derivatives, i.e. acceleration, usually
implies noisier results while the opposite process (the numerical integration
of a temporal evolution) gives rise to the accumulation of errors. In a
classroom situation, the comparison between these two techniques offers an
opportunity to discuss not only concepts related to the specific experiment but
also with the experimental and numerical aspects including their pros and cons.

17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph