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  4. On the 2016 AP Physics C Free Response (Mech 1), it states that a force sensor pulls a string which in turn pulls a cart of mass m. It states that there is friction between the cart and the track and labels in a data table Force sensor reading and corresponding acceleration. Question b) asks the student to graph the acceleration and force to then eventually take the slope of that graph to determine the unknown mass of the cart. My confusion is that the force sensor is not reading the Net Force only the applied force. If there is friction involved how are they using the Force sensor values as the "NET FORCE" in order to find the mass? Thank you for any explanation.
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  7. The largest damping force is the air resistance on the mat. "Fly mats" are mats made from 4 mm wide webbing on 10 mm spacing. Or made from pairs of string about 1.5 mm wide per pair on 4 mm spacing. The net effect is that it's a net. With over 50% holes. One thing you notice on first jumping on a fly mat: You don't lose energy as fast. If you are used to losing a third of your energy doing a doggie drop, and then do this same trick on a fly mat and get 90% of your energy back it will scare the pants off of you. Good mats are not stretchy. You want all the energy storage to be in the springs, which are better at returning it. Most elastics fabrics are very poor at returning energy -- 40-60% especially in directions not along the weave.
  8. Hey, Really it was an great article to read,Waiting for another one till that get more information about electric toasters ,Keep it up!
  9. I needed this explanation for my homework. Thank you very much for it, as it is very detailed and understandable.
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