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### 19 Cards in this Set

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 Newton's 3rd Law For every action, there is an equal and opposite reaction- If Object A pushes on Object B, Object B pushes back on object A with an equal and opposite force Action Reaction forcxes don't cancel because they're acting on different objects Momentum inertia in motion p=mv (vector) related to Newton's 1st law Units: kgm/s Impulse change in momentum I=^P=Ft ^= change in Related to Newton's 2nd Law: A= F/M ^v/t=F/m m^v=ft ^p=Ft Follow through makes force last koinger ^p=Ft p= as big as possible F= smae t= more time on contact Helmets and Air Bags ^p=Ft p= same F= smaller when time is longer (less) t= longer with air bag Law of Conservation Of Momentum The total momentum of a system remains the same unless there's an outside net force Pbefore=Pafter Bouncing bigger ^p than stopping bounce is double the impulse Momentum concentration Car collision example: Work How energy is transfered (how an object gains or loses energy) W=F,,d W= work ,,= parallel d= distance in direction of motion circular definition with energy Lift 1N object 1m high W= (1N)(1m)= 1J Nm= J J = joules Energy ability to don work (E) calculated in J J Joules Types of Energy mechanical light heat sound electromagnetic ect... Mechanical Energy Potential energy (PE) energy due to position Kinetic Energy (KE) energy due to motion PE Wdone to put the onject there Power Rate of doing work, transferring energy P=W/t=E/t J/s= W (watts) W Watts 60 W lighhtbult take 60 J of electric E and turnsd it into 60J of light and heat every second 1 W= doing 1 J of work every 1 second Power walking up stairs vs. running up stairs same enrgy (same work to lift body to same height) More POWER to run up PEgrav= work required to lift object to that height =Fgravd = (mg)(h) PEgrav= mgh Arbitraru Zero ground level path independent Kinetic Energy KE= work needed to get up to speed v= (fd) KE= 1/2mv2