# Physics - in-depth

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Learn about the nature and physical properties of matter and energy. Created by Khan Academy.

Recommended that you have a strong foundation in Algebra and Trigonometry before taking this course.

###### Average Course Length

40 hours

###### Skill Level

Intermediate

##### Pick a lesson

1: Introduction to Vectors and Scalars

2: Calculating Average Velocity or Speed

3: Solving for Time

4: Displacement from Time and Velocity Example

5: Acceleration

6: Newton's First Law of Motion

7: Newton's Second Law of Motion

8: Newton's Third Law of Motion

9: Airbus A380 Take-off Time

10: Airbus A380 Take-off Distance

11: Why Distance is Area under Velocity-Time Line

12: Average Velocity for Constant Acceleration

13: Acceleration of Aircraft Carrier Takeoff

14: Race Cars with Constant Speed Around Curve

15: Introduction to Gravity

16: Mass and Weight Clarification

17: Gravity for Astronauts in Orbit

18: Would a Brick or Feather Fall Faster

19: Deriving Displacement as a Function of Time, Acceleration and Initial Velocity

20: Plotting Projectile Displacement, Acceleration, and Velocity

21: Projectile Height Given Time

22: Deriving Max Projectile Displacement Given Time

23: Impact Velocity From Given Height

24: Visualizing Vectors in 2 Dimensions

25: Projectile at an Angle

26: Different Way to Determine Time in Air

27: Launching and Landing on Different Elevations

28: Total Displacement for Projectile

29: Total Final Velocity for Projectile

30: Correction to Total Final Velocity for Projectile

31: Projectile on an Incline

32: Unit Vectors and Engineering Notation

33: Optimal angle for a projectile part 1

34: Optimal angle for a projectile part 2 - Hangtime

35: Optimal angle for a projectile part 3 - Horizontal distance as a function of angle (and speed)

36: Optimal angle for a projectile part 4 Finding the optimal angle and distance with a bit of calculus

37: Normal Force and Contact Force

38: Normal Force in an Elevator

39: Inclined Plane Force Components

40: Ice Accelerating Down an Incline

41: Force of Friction Keeping the Block Stationary

42: Correction to Force of Friction Keeping the Block Stationary

43: Force of Friction Keeping Velocity Constant

44: Intuition on Static and Kinetic Friction Comparisons

45: Static and Kinetic Friction Example

46: Introduction to Tension

47: Tension (part 2)

48: Tension in an accelerating system and pie in the face

49: Private video

50: Private video

51: Introduction to Momentum

52: Momentum: Ice skater throws a ball

53: 2-dimensional momentum problem

54: 2-dimensional momentum problem (part 2)

55: Introduction to work and energy

56: Work and Energy (part 2)

57: Conservation of Energy

58: Work/Energy problem with Friction

59: Introduction to mechanical advantage

60: Mechanical Advantage (part 2)

61: Mechanical Advantage (part 3)

62: Center of Mass

63: Introduction to Torque

64: Moments

65: Moments (part 2)

66: Unit Vector Notation

67: Unit Vector Notation (part 2)

68: Private video

69: Private video

70: Projectile Motion with Ordered Set Notation

71: Centripetal Force and Acceleration Intuition

72: Visual Understanding of Centripetal Acceleration Formula

73: Relationship between angular velocity and speed

74: Calculus proof of centripetal acceleration formula

75: Loop De Loop Question

76: Loop De Loop Answer part 1

77: Loop De Loop Answer part 2

78: Acceleration Due to Gravity at the Space Station

79: Space Station Speed in Orbit

80: Conservation of angular momemtum

81: Introduction to Newton's Law of Gravitation

82: Gravitation (part 2)

83: Intro to springs and Hooke's Law

84: Potential energy stored in a spring

85: Spring potential energy example (mistake in math)

86: Introduction to Harmonic Motion

87: Harmonic Motion Part 2 (calculus)

88: Harmonic Motion Part 3 (no calculus)

89: Fluids (part 1)

90: Fluids (part 2)

91: Fluids (part 3)

92: Fluids (part 4)

93: Fluids (part 5)

94: Fluids (part 6)

95: Fluids (part 7)

96: Fluids (part 8)

97: Fluids (part 9)

98: Fluids (part 10)

99: Fluids (part 11)

100: Fluids (part 12)

101: Thermodynamics (part 1)

102: Thermodynamics (part 2)

103: Thermodynamics (part 3)

104: Thermodynamics (part 4)

105: Thermodynamics (part 5)

106: Electrostatics (part 1): Introduction to Charge and Coulomb's Law

107: Electrostatics (part 2)

108: Proof (Advanced): Field from infinite plate (part 1)

109: Proof (Advanced): Field from infinite plate (part 2)

110: Electric Potential Energy

111: Electric Potential Energy (part 2-- involves calculus)

112: Voltage

113: Capacitance

114: Circuits (part 1)

115: Circuits (part 2)

116: Circuits (part 3)

117: Circuits (part 4)

118: Cross product 1

119: Cross Product 2

120: Cross Product and Torque

121: Introduction to Magnetism

122: Magnetism 2

123: Magnetism 3

124: Magnetism 4

125: Magnetism 5

126: Magnetism 6: Magnetic field due to current

127: Magnetism 7

128: Magnetism 8

129: Magnetism 9: Electric Motors

130: Magnetism 10: Electric Motors

131: Magnetism 11: Electric Motors

132: Magnetism 12: Induced Current in a Wire

133: The dot product

134: Dot vs. Cross Product

135: Calculating dot and cross products with unit vector notation

136: Introduction to Waves

137: Amplitude, Period, Frequency and Wavelength of Periodic Waves

138: Introduction to the Doppler Effect

139: Doppler effect formula for observed frequency

140: Doppler effect formula when source is moving away

141: When the source and the wave move at the same velocity

142: Mach Numbers

143: Specular and Diffuse Reflection

144: Specular and Diffuse Reflection 2

145: Refraction and Snell's Law

146: Refraction in Water

147: Snell's Law Examples 1

148: Snell's Law Example 2

149: Total Internal Reflection

150: Virtual Image

151: Parabolic Mirrors and Real Images

152: Parabolic Mirrors 2

153: Convex Parabolic Mirrors

154: Convex Lenses

155: Convex Lens Examples

156: Concave Lenses

157: Object Image and Focal Distance Relationship (Proof of Formula)

158: Object Image Height and Distance Relationship

159: Viewing g as the value of Earth's Gravitational Field Near the Surface