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### 25 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, the object B pushes back on object A with an equal and opposite force - Can't hit anything harder than it can hit you Action- Reaction Action- reaction forces don't cancel becase they're acting on different objects Momentum - inertia in motion - p=mv - units: kgm/s -related to Newton's 1st Law Impulse - change in momentum - I=^p=Ft -Related to Newton's 1st Law - a=F/m ^V/t=F/m m^v=ft ^p=Ft Follow Through ^p=Ft ^p- as big as possible F- same t- more time in contact - Make force last longer Helmets and Air bags ^p=Ft ^p- same F- Smaller when time is less t- longer with air bag Law on Conservation of Momentum The total momentum of a system remains the same unless there's an outside net force. Pbefore=Pafter The mometnum of a system stays the same unless a net outside force Bouncing - bigger than ^p than stopping - bounce is a double impulse Momentum Concentration - Car and airplane crash - Pbefore= Pafter Work - How energy is transferred - How an object gains and loses energy W=F//d //- parallel Nm= J Energy - Ability to do work (E) - Joules - circular definition J Joules Types of Energy Mechanical Energy - potential energy (PE) energy due to position (work done to put the object there) - Kinetic energy (KE) energy due to motion Power - Rate of doing work, rate of transferring energy P= w/t=E/t J/s= W (watts) 1 Watt- doing 1 J of work in 1 s Potential Energy Walking vs. Running up stairs Same energy ( same work to lift body to same height) - More power to run up PEgrav= work required to life object to that height =Fgravd =(mg)(h) Ground level - Arbitrary Zero - Path independent Kinetic Energy KE= work needed to get up to speed v=(fd) =1/2mv2 Econs - The total amount of E in the universe always remains the same Useable Energy - KE - PE - Electricity - Light - Chemical Un-useble Energy - heat Sun - coal-dead plant- sun - oil- dead animals-plants- sun Heat Death - All energy transfers always involve a confersion of some energy to heat- spreads out and done with heat - eventually it will all be heat Gun Bullet Example Fgun=Fbullet agun