http://msuperl.org/wikis/pcubed/ 2026-05-03T23:12:07+00:00 http://msuperl.org/wikis/pcubed/ http://msuperl.org/wikis/pcubed/lib/tpl/bootstrap3/images/favicon.ico text/html 2014-07-24T02:09:57+00:00 Anonymous (anonymous@undisclosed.example.com) http://msuperl.org/wikis/pcubed/doku.php?id=temp:prelec:cf-g&rev=1406167797&do=diff Pre-lecture:Local Gravity * In the absence of other interactions, we observe that things fall at a rate of 9.8 m/s/s. There's some flexibility in this number, but it's pretty close to this value everywhere on earth. * It's special we call it 'g' text/html 2014-07-17T12:57:50+00:00 Anonymous (anonymous@undisclosed.example.com) http://msuperl.org/wikis/pcubed/doku.php?id=temp:prelec:cf&rev=1405601870&do=diff Pre-lecture: Constant Force Motion * The MP predicts the motion of systems: write out predictive bit * When the net force is a constant vector, the motion is quite special (velocities and positions can be predicted exactly) * Let's take a special case of one-dimensional motion with constant force (derivation equally applies to vector) - fan cart moving under constant fan force text/html 2014-07-17T12:59:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://msuperl.org/wikis/pcubed/doku.php?id=temp:prelec:momentum&rev=1405601953&do=diff Pre-lecture: Momentum and Momentum Principle * Changes in motion; you pay attention to how an object changes it position * Define momentum - some objects are easier to change their motion than others * $\vec{p} = \gamma m \vec{v}$ is a vector concept; points in direction of velocity vector for a system; complete and alway applies$\gamma$$\gamma$$\gamma \approx 1$$\vec{p}=m\vec{v}$$\Delta \vec{p} = \vec{F}_{net}\Delta t$ text/html 2014-07-24T01:54:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://msuperl.org/wikis/pcubed/doku.php?id=temp:prelec:newtoniangravitation&rev=1406166841&do=diff Pre-lecture: Gravitation * Earlier we talked about mg * It turns out that is an approximate form for the interaction between two objects with mass, which i'll describe now * Consider the Earth and the Moon. * Certainly, you've heard the Earth and Moon are attracted to each other text/html 2014-07-24T02:03:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://msuperl.org/wikis/pcubed/doku.php?id=temp:prelec:springs&rev=1406167420&do=diff Pre-lecture: Constant vs. Non-constant Forces (Springs) * The MP lets us predict the motion of any system subject to any interaction * Sometimes we can do that with pencil and paper and other times, we can't * We can always predict the motion of a system with pencil and paper when the net force is constant over the interval we care about