# PhysicsFinalReview

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 Author: victimsofadown ID: 274971 Filename: PhysicsFinalReview Updated: 2014-05-21 12:27:49 Tags: PhysicsFinalReview Folders: PhysicsFinalReview Description: PhysicsFinalReview Show Answers:

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1. Describe the shape/direction of electric field lines
• They radiate outward from + charges and toward - charges (test charge is +)
• They form various shapes if they are near eachother
2. What does "F12" mean?
The force that 1 exerts on 2 (look at it from 2's perspective)
3. tan/sin/cos?
• tan = opp/adj
• sin = opp/hyp
• cos = adj/hyp
4. Other useful equations to remember regarding force?
• F=ma
• F=mv2/r  (circular motion)
5. Describe electric potential of charges in a parallel plate capacitor
charges move from + to - therefore charges that are closer to the + plate have increased potential energy
6. How do you determine the potential energy of a group of charges? (a system)
Detrmine the potential energy (Vq = kq1q2/r) for each point and then sum them.  Easy.
7. How do you determine the difference in energy of something between 2 plates?
• KE + PE = KE + PE
• If stopped, KE=0
• If at the - plate, PE = 0
8. Describe the equivalent properties (q,V,C) for a capacitor in series.  A resistor? (R, I)
• qeq=q1=q2=q3
• V=V1+V2+V3
• 1/Ceq=1/C1+1/C2+1/C3
• Req=R1+R2+R3
• I=I1=I2=I3
9. Describe the equivalent properties (q,V,C) for a capacitor in parallel. A resistor? (R,I)
• q=q1+q2+q3
• V=V1=V2=V3
• C=C1+C2+C3
• 1/Req = 1/R1+1/R2+1/R3
• I=I1+I2+I3
10. Describe Kirchoff's point rule.
The sum of current into a junction is equal to the sum of the current out of a junction
11. How do you perform Kirchoff's loop rule?
• 1. Choose a direction for I
• 2. Choose a start point
• 3. Move along the circuit in a direction, moving back toward point chosen in step 2
• 4. Use rules for crossing various elements and place into equation
• 5. Apply loop rule
• 6. Solve for the unknown
12. What is internal resistance?
The resistance WITHIN a battery (should be obvious)
13. Magnetic field direction?
Flows from north and into south
14.   vs    vs
• eq1 = long straight wire carrying a current, causing circular magnetic field around it
• eq2 = loop carrying a current, causing straight magnetic field through center (a=radius of loop)
• eq3 = solenoid carrying a current, causing straight magnetic field through center (n = #turns/unit length)
15. symbols for into vs out of page (magnetic field)
x is into and o is out of
16. What are the various "right hand rules"
• For current in a loop: thumb aligns with current and fingers curve to show direction of B field
• For wire in a B field: I(thumb) B(index) F(middle)
• For charged particle in a B field: v(thumb) B(index) F(middle)
• ***remember if charge is negative then reverse direction!
17. What is the equation for the force of a circular object?
18. What are the two types of mechanical waves (direction)
• Transverse: the element moves vertically white the velocity is horizontal
• Longitudinal: the element AND velocity move only horizontally
19. What are the characteristics of a wave?
• frequency (f): # oscillations per second
• wave length (λ): distance wave travels before it repeats
• Period (t): time it takes for one cycle to be completed
• f=1/t
20. Difference between electromagnetic waves and mechanical waves?
EM waves do not need a medium to travel
21. Wave front vs ray? What is their relationship?
• Wave front: the wave itself (the ripple after throwing a stone)
• Ray: the direction that the wave travels
• Wavefronts and rays are always perpendicular
22. Describe the laws of reflection, refraction, and diffraction
• *remember- all angles taken between ray and NORMAL of surface
• reflection: Angle of incidence = angle of reflection
• Law of refraction: angle of incidence > angle of refraction
• ray refracts TOWARD the normal
23. What is the critical angle?
• When the angle of refraction becomes 90 degrees
• Anything above is total internal reflection
24. Describe the reflections of a concave mirror
• a ray parallel to the principal axis is reflected through F
• a ray that pass through F is reflected parallel to the principal axis
• a ray that meets the mirror at the principal axis is reflected at the same angle
• a ray that passes through O is reflected directly back (180)
25. What makes an image real, inverted, larger, smaller, etc in a reflection?
• real/virtual: if the light meets in front of the mirror it is a real image
• inverted/upright: if the light meets on the opposite side of the principal axis then it is projected from it is inverted
• larger/smaller: if the light meets at a point PAST the source then it is larger
26. Describe the light passthrough in a converging lens
• ()
• Ray parallel to principal axis passes through focal point on other side
• Ray passing through principal axis in center of lens continues without refraction (0 change)
• Ray passing through focal point continues straight on other side
27. Describe light passthrough in a diverging lens
• )(
• Ray parallel to principal axis refracts away from the principal axis so that an imaginary line from the focal point is straight
• Ray passing through principal axis in center of lens continues without refraction
• Ray aimed at opposite side F (imaginary line) will come out parallel to principal axis

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