Physics Timeline Forces and Motion Distance, Time, Speed and Velocity o Variables, units (examples), how to measure, measuring practice Rulers, stopwatches, calculators o ‘4 steps’ to solving problems -----Quiz---- Acceleration o Direction, fraction dropping, stoplight activity, ‘speed each second’ practice o Gravity (g) and terminal velocity Force- push or pull o Mass vs. weight. “the amount of ‘stuff’”. Newtons unit. Slanted books mass pull w/ spring scales. Book push with probeware. o Net force- practice sheet. Balanced vs. unbalanced. Tug O War. -----Quiz---- Newtons Laws o 1st- ‘Object in motion tends to stay in motion…’ ‘Frictionless’. Zero force = zero acceleration not zero velocity nd o 2 - ‘F=ma’ Shopping cart full of bricks. Practice problems. rd o 3 - ‘Equal and opposite forces…’ Force subscripts- Fcar on wall – practice sheet Why is there acceleration if all forces are always opposed? The forces act on different things! -----Quiz---- Circular Motion o Centripetal force (Fc ) always points toward center of curvature o Fc is always perpendicular to tangential velocity (vt) – practice sheet o Gravitational force (Fg) always points toward center of mass – practice sheet o If net force (Fc and/or Fg)on same side as vt, = acceleration, opposite side = deceleration, perpendicular = no acceleration -----Test----Energy and Momentum Potential energy equation o Determined by mass and height Mass vs. weight! Practice problems. Kinetic energy equation o Determined by mass and speed/velocity Speed buggy measure and calc Practice problems. -----Quiz---- Conservation of energy o Total mechanical energy = PE + KE = always conserved (lie) o Falling object problems. -----Test----- Momentum o ‘Mass in motion’. Practice problems. Conservation of momentum o Collisions Elastic- ‘objects separate after collision’- problems. Type of collision, not a kind of material! billiards Inelastic- ‘ objects combine/attach/stick/join after collision’- problems Train cars, magnets, gum, clay, mud, arrow, bullet -----Quiz---------Test----Thermodynamics Work- transfer of energy through use of force o Must move a distance or no work done (pushing on a wall, pinkie on table) o Joules unit o Power is rate of work- Watts unit. -----Quiz---- Thermal energy (heat) as KE of molecules o States of matter, temperature scales F, C and K. 273 degree shift. Absolute zero. o Heat transfer is always hot to cold unless outside work is performed. – heat boxes sheet Heat engines o High temp energy [in], low temp energy and work [out]. Total energy in = total energy out o Steam engine, car engine, humans. -----Quiz---- Entropy- measure of disorder o Sticks activity. High/low entropy states- examples: silverware drawer, jar of pennies, perfume bottle, relative entropies of different energy forms (“fits in a bucket = ordered”). o Time increases entropy of a system ‘Whatever happens if you wait = the one with more entropy’ Rocks to sand, ice to water, coal/electricity to heat -----Test----Waves Wave parts vocabulary. Crest, Trough, Amplitude, Midpoint/Equilibrium line o Draw and label parts. “paper pull’ activity. Wave speed calculations (v, λ, f, T). o String/washer pendulums. Newton’s cradle. Measure λ, T : Calc f, v -----Quiz---- Transverse vs Longitudinal- Label crest/trough/amplitude for each o Slinkys. Dominoes. Rope. Wave tape(straws). ‘The Wave’ around class. ‘line bump’. Water ripples. Sound. Light. o Mediums. Wave direction vs medium direction. Perpendicular/Parallel. Mediums and effect on wave speed. o Speed of light in vacuum, speed of sound in vacuum. Hot/Cold effect. States of matter effect. -----Quiz---- EM Spectrum, examples of each, order by energy/wavelength/frequency, sourch and detector, materials/ways to block signal -----Test---- Wave properties o Interference- xylophone beats, combining waves sheet/blocks, transparency dot strips o Diffraction- Spectroscopes with different light sources (candle, blacklight, colored light, element tubes o Refraction- ruler/beaker/water activity, flashlight rainbow, prisms o Doppler effect- buzzer in ball, radar gun, train, siren, tuning fork by ear Different than change in amplitude! o Polarization- ropes in quadrat, polarizing film squares? [transverse only] -----Quiz---------Test----Electricity and Magnetism Electric circuits o Building simple circuits of wires, batteries, bulbs, resistors (& capacitors)- Springboards w/ 9V batteries o Diagrams- straight sides, right angle corners o Series and Parallel circuits- effect on voltage and therefore intensity of light bulb o Short circuits (waste energy), Fuses (steel wool wires) Ohm’s Law- V = IR o Measure some, calc others -----Quiz---- Electrostatics o Charge- positive and negative, attraction/repulsion Conduction and Induction of charges Induction- balloon affects: water stream, cans, confetti o Discharge- lightning, Van de Graf generator, ball wand, snake wand, shocks -----Quiz---- Magnetism o North and South, attraction/repulsion, Domains, magnetizing a nail, 3D filings & cow magnet, ‘magic’ tricks/anti-gravity o Induction- how refrigerator magnets work -----Quiz---- Fields o Magnets cause current, Current causes magnetism Make electromagnets, effect of coils, effect of more voltage o Right-hand rule -----Test----Review semester topics -----Final-----