  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.
