# Physics 4 Momentum, Machines, and Radioactive decay.txt

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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
J=FavgΔt
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
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
 Author: p.reilly1227 ID: 233871 Card Set: Physics 4 Momentum, Machines, and Radioactive decay.txt Updated: 2013-09-09 22:28:05 Tags: Physics Momentum Machines Radioactive decay Folders: Description: Physics 4 Momentum, Machines, and Radioactive decay.txt Show Answers: