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25 Cards in this Set

  • Front
  • Back
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
- inertia in motion
- p=mv
- units: kgm/s
-related to Newton's 1st Law
- change in momentum
- I=^p=Ft
-Related to Newton's 1st Law
- a=F/m
Follow Through
^p- as big as possible
F- same
t- more time in contact
- Make force last longer
Helmets and Air bags
^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.
The mometnum of a system stays the same unless a net outside force
- bigger than ^p than stopping
- bounce is a double impulse
Momentum Concentration
- Car and airplane crash
- Pbefore= Pafter
- How energy is transferred
- How an object gains and loses energy
//- parallel
Nm= J
- Ability to do work (E)
- Joules
- circular definition
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
- 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
Ground level
- Arbitrary Zero
- Path independent
Kinetic Energy
KE= work needed to get up to speed
- The total amount of E in the universe always remains the same
Useable Energy
- KE
- PE
- Electricity
- Light
- Chemical
Un-useble Energy
- heat
- 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
agun- becuase it has more mass- more inertia, resisting more change
Earth Acc
- going towards earth
- earth coming up
- small acc because of big mass
Changing speed
-double the speed
- square the relationship (square KE)