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Physics 101 Week 1 Class Notes

by: Montgomery Notetaker

Physics 101 Week 1 Class Notes Physics 101

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hidfkjsdfhskdjfhskjdfhskjfhs Date: August lecture/textbook email me
Objects in Motion
Class Notes
Physics, gravity, motion
25 ?




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This 4 page Class Notes was uploaded by Montgomery Notetaker on Thursday August 11, 2016. The Class Notes belongs to Physics 101 at Carnegie Mellon University taught by Newton in Fall 2016. Since its upload, it has received 7 views. For similar materials see Objects in Motion in Physics at Carnegie Mellon University.

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Date Created: 08/11/16
Alyssa Montgomery Design Internal Assessment Running Shoes: Friends or Foes? Research Question: What effect does the thickness of the shoe’s sole have on the amount of force being transferred  to the runner’s knee? Hypothesis: If the thickness of the shoe’s sole is increased, then the force applied to the runner’s knee  will be less. The theory behind this experiment is that since force is equal to the change in momentum over the change in time, by keeping the momentum of the foot the same but increasing the time  that it takes for that force to be applied, then the force will decrease because by dividing by a  larger period of time over a constant momentum will cause the quotient to be smaller. Variables: Manipulated Variable: The width of the shoe sole will be changed throughout the experiments. Starting from a  width of 0 cm (no sole) increasing in increments of .5 cm, the sole of the shoe will keep  increasing until a width of 5 cm is reached.  When measuring the thickness of the rubber inserts,  one can use a set of calipers.  The uncertainty will be around +/­ 0.05 cm, but it can change  depending on the set of calipers that are used. Responding Variable: The measured amount of force is the responding variable, and with each change of  thickness, the force will be measure by a force sensor at the position where a human knee would  be found. The uncertainty of the force sensor will vary with which force sensor is used. Controlled Variables: The variables that must remain constant in the experiment are the mass of the foot that is  being dropped, the height at which the foot is being dropped, and the material of the sole.  First  of all, the mass of the foot will be one of the harder variables to keep constant because rubber,  which the materials of the sole is made out of, is a heavier substance, so it is necessary to weight  the foot before each trial to make sure the mass is constant so as not to change the momentum  constant.  Likewise, the height at which the foot is dropped must be kept constant for the same  reason, and the foot will be dropped from 0.5 meters (+/­ 0.05 cm) to simulate length of person’s  shin.  The material must also be kept constant because some materials might slow down the  falling foot faster, but unless it is kept constant, one will not know if the thickness really  decreases the force applied or if the material is affecting the force, therefore it has to be kept  constant. Procedure: Materials Needed:  Meter stick  Pair of running shoes with rubber soles  Rubber inserts of a thickness of .5 cm  Force sensor  Stop watch   Camera  A set of weights  Calipers  Scale Attention:  When the foot is being dropped, although the mass is not terribly large it is important  to not be under the falling foot.   Set­up: Method: 1.  Start by setting up the experiment like the in the image shown above.  The foot should start  shoeless, and when weighed before the trial takes place it should be 5 kg (+/­ 0.5 g).   2. Then taking the 5 kg foot, raise it 0.5 m above surface level, and start the camera.  3. Drop the foot, while starting the timer, and when the foot touches the ground and stops  completely, stop the watch quickly. 4. Repeat this trial 5 times.  Then add an insert. 5. Weight the foot again and adjust the additional weights to ensure that the foot’s mass remains  constant. 6. Repeat steps 2­5 until the thickness of the sole reaches 5 cm. Trial Number (5  Thickness of the  Mass of the Foot (g) Time (s) Force (N) trials per settingSole (cm) 1 2 3 4 5 1 2 3 4 5


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