Physics 4 Momentum, Machines, and Radioactive decay.txt

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Physics 4 Momentum, Machines, and Radioactive decay.txt
2013-09-09 18:28:05
Physics Momentum Machines Radioactive decay

Physics 4 Momentum, Machines, and Radioactive decay.txt
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    • author "me"
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    • fileName "Physics 4 Momentum, Machines, and Radioactive decay"
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    • Define momentum and give equation
    • (p) measure of an objects tendency to continue along its path. Proportional to velocity and mass
    • p=mv
  1. Two things to remember about momentum
    • 1: conserved in an isolated system
    • 2: it is a vector
  2. How to solve elastic collision vs inelastic collision problems
    • Elastic: use conservation of energy
    • Inelastic: (in an isolated system) use p(initial)=p(final)
  3. Define impulse and give equation
    • Impulse (J): IAS equal to change in momentum
    • J=Δp
  4. Equation for the average force on colliding bodies
  5. Equation to find average force from change in momentum
    Δmv=FavgΔ t
  6. Define a machine
    Machine: mechanical device which reduces force to do work. Work does not change
  7. Define radioactive decay
    Radioactive decay: spontaneous breaking apart of atoms
  8. Alpha decay
    (Z-2) and (a-4)
  9. Beta decay
    • Creation of an electron and proton from a neutron. Election is expelled
    • (Z+1) and (a+0) and (-e-1)
  10. Positron emission
    • Expulsion of a positron when a proton becomes a neutron
    • (Z-1) (a+0) (+e-1)
  11. Electron capture
    • Capture electron and merge it with a proton to form a neutron
    • (Z-1) (-e+1) (a-0)
  12. Define fusion and fission
    • Fusion: cumbining two nuclei to form a heavier nucleus
    • Fission: splitting a nucleus to form two lighter nuclei