# 96148 - Physics 2211 Matter and Interactions Dr Ed Greco...

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Physics 2211: Matter and Interactions Dr. Ed Greco Test 1 Coverage You must memorize: definition of momentum for any speed, definition of the average velocity, the momentum principle How to write the update formula for a constant force How to use vectors and trigonometry Review the concepts described in Newton's Three Laws Momentum Conservation and Collisions Iterative predictions of motion (Including VPython) Gravitational and Coulomb Force Laws  r = p i m t 1 2 F i m  t 2

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Physics 2211: Matter and Interactions Dr. Ed Greco Test 1 Study Tips (with the caveat that everyone is different) Do the reading: Take the Stop and Think questions seriously, do the in-line exercises at the end of each section, study the worked examples. Review your HW assignments: Be honest with yourself, could you do the problem with less scaffolding? Work the more difficult problems at the end of each Chapter Review your Labs and Lab Quizzes The test is not a reformulation of problems you have already done. We are testing how well you know the concepts and your ability to use them Work problems with a physics expert (Instructor, TA, Tutor, etc.) When in doubt write down the momentum principle!
Physics 2211: Matter and Interactions Dr. Ed Greco Model of a solid: All matter consist of atoms: ``uncuttable” Democritus (460 BC - 370 BC) 1. Atoms attract each other when they are close but not too close. 2. Atoms repel one another when they get too close to each other 3. Atoms in solids, liquids and gases keep moving even at very low temperatures = 1 × 10 10 m

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Physics 2211: Matter and Interactions Dr. Ed Greco A chemical bond between two atoms acts like a spring. Equilibrium Close Too Close Ball-Spring Model
Physics 2211: Matter and Interactions Dr. Ed Greco Everyday solids are made up of millions and millions of atoms (balls and springs) At room temperature the atoms are in motion in the form of lattice vibrations. The cubic lattice of a solid is not very stable but gives good approximations. Ball and Spring Cubic Lattice

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Physics 2211: Matter and Interactions Dr. Ed Greco PRS: How does the diameter of one atom in a solid compare to the length of an atomic bond in our model (1) The bond length is greater than the atomic diameter (2) The bond length is less than the atomic diameter (3) They are the same
Matter and Interactions Dr. Ed Greco Tension From our previous analysis of tension we determined that the larger the mass the great the tension in the wire Does this fit with our model of a solid? Replace the wire with a long thin chain of atoms Assume massless springs The larger the mass the bigger the stretch! F

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96148 - Physics 2211 Matter and Interactions Dr Ed Greco...

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