# Equations and important concepts

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 Author: raquelvsuarez ID: 273569 Filename: Equations and important concepts Updated: 2014-05-07 02:14:38 Tags: MCAT physics Chad Folders: Description: Equations and Important concepts Chad's videos All Physics' days Show Answers:

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1. Sin (0)
0
2. Sin(30)
0.5
3. Sin(45)
0.7
4. Sin(60)
0.87
5. Sin(90)
1
6. Cos(0)
1
7. Cos(30)
0.87
8. Cos(45)
0.7
9. Cos(60)
0.5
10. Cos(90)
0
11. SOH CAH TOA
• Sin (θ)= O/H
• Cos (θ)= A/H
• Tan (θ)= O/A
12. Force m*a
• Mass*acceleration
• Kg*m/s²
13. Joules derivation-using work formula
• W=F*d
• J=N*m
• J=(Kg*m/s²)*m
• J=Kg*m²/s²
14. Joules derivation-using Energy formula
• KE=1/2mv²
• J=Kg(m/s)²
• J=Kg*m²/s²
15. PE:mgh
• J=Kg(m/s²)m
• J=Kg*m²/s²
16. Watts derivation-using the power formula
• P=W/T Power=Work/Time
• W=J/s
• W=N*m/s
• W=(Kg*m/s²)(m/s)
• W=Kg(m²/s²)
17. Vector
Magnitude + direction
18. Scalar
Magnitude ONLY
19. Displacement vs distance
• Displacement is how far you are from where you started in a straight line path,while distance is the total steps you took to get there regardless of the path.
• Displacement is a vector
• Distance is a scalar
20. Velocity
• V=∆d/∆t
• Velocity equals the change in distance over time
• m/s
21. ****Note: Velocity includes both magnitude and direction, speed is only the magnitude
22. Acceleration
• a=∆V/T
• Acceleration equals the change in velocity over time
• m/s²
23. ****Note: Since acceleration is proportional to Velocity, when velocity changes EITHER IN MAGNITUDE OR DIRECTION, acceleration changes!
24. @Rest=no acceleration
Constant velocity=no acceleration
25. Gravity 10(m/s)/s
• *Every second your velocity changes by 10m/s
• -Sec 0= 0m/s
• -Sec 1= 10m/s
• -Sec 2= 20m/s
26. When is g positive or negative in a problem?
Consider the three variables: Acceleration (a), Velocity (V) and Displacement (d)
27. *if all three point in the same direction, then it doesnt matter, they can all be + or -
*If one of them points in a different direction, then you have to pick a point of reference and stick to it.
28. Which equation can be use when there is NO a? d=vt
distance=velocity*time
29. Which set of equations is available when there is a?
• d=(Vavg)(t)
• d= Vi*t + (1/2)at²
• Vf= Vi + at
•  or     *When Vi=0
30. d=(Vavg)(t)
31. d= Vi*t + (1/2)at²
33. Vf= Vi + at
34. In the graph of Displacement vs Time, what does the slope mean? Does the area under the curve have any meaning?
• The slope is Velocity
• No, the area under the curve is useless
35. In the graph of Velocity vs Time, what does the slope mean? Does the are under the curve have any meaning?
• The slope is acceleration
• Yes, the area under the curve is displacement
36. What's Newton's first law?
, then velocity is constant

*A body in motion will stay in motion if no there is no net force being applied on the body. Or a body at rest will stay at rest unless there is a net force being applied on the body
37. What's Newton's second law?

Force=mass*acceleration
38. What's Newton's Third Law?

Every force has an equal and opposite force

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