Physics - Khan Academy FREE

1) Introduction to Vectors and Scalars

Distance, displacement, speed and velocity. Difference between vectors and scalars More free lessons at: http://www.khanacademy.org/video?v=ihNZl

2) Calculating Average Velocity or Speed

Example of calculating speed and velocity More free lessons at: http://www.khanacademy.org/video?v=oRKxm

3) Solving for Time

Simple example of solving for time given distance and rate More free lessons at: http://www.khanacademy.org/video?v=awzOv

4) Displacement from Time and Velocity Example

Worked example of calculating displacement from time and velocity More free lessons at: http://www.khanacademy.org/video?v=lQ-dv

5) Acceleration

Calculating the acceleration of a Porshe More free lessons at: http://www.khanacademy.org/video?v=FOkQs

6) Newton's First Law of Motion

Newton's First Law (Galileo's Law of Inertia). More free lessons at: http://www.khanacademy.org/video?v=CQYEL

7) Newton's Second Law of Motion

Newton's Second Law of Motion: F=ma More free lessons at: http://www.khanacademy.org/video?v=ou9YM

8) Newton's Third Law of Motion

Every action has an equal and opposite reaction More free lessons at: http://www.khanacademy.org/video?v=By-gg

9) Airbus A380 Take-off Time

Figuring how long it takes an a380 to take off given a constant acceleration More free lessons at: http://www.khanacademy.org/video?v=p4DTo

10) Airbus A380 Take-off Distance

How long of a runway does as a380 need More free lessons at: http://www.khanacademy.org/video?v=fQt69

11) Why Distance is Area under Velocity-Time Line

Understanding why distance is area under velocity-time line More free lessons at: http://www.khanacademy.org/video?v=d-_eq

12) Average Velocity for Constant Acceleration

Calculating average velocity when acceleration is constant More free lessons at: http://www.khanacademy.org/video?v=MAS6m

13) Acceleration of Aircraft Carrier Takeoff

Using what we know about takeoff velocity and runway length to determine acceleration More free lessons at: http://www.khanacademy.org/video?v=VYgSX

14) Race Cars with Constant Speed Around Curve

When acceleration could involve a change in direction and not speed More free lessons at: http://www.khanacademy.org/video?v=ITA1r

15) Introduction to Gravity

Basics of gravity and the Law of Universal Gravitation More free lessons at: http://www.khanacademy.org/video?v=Xcel4

16) Mass and Weight Clarification

Difference between mass and weight More free lessons at: http://www.khanacademy.org/video?v=IuBoe

17) Gravity for Astronauts in Orbit

Why do astronauts appear weightless despite being near the Earth? More free lessons at: http://www.khanacademy.org/video?v=oIZV-

18) Would a Brick or Feather Fall Faster

What would fall faster on the moon? More free lessons at: http://www.khanacademy.org/video?v=36Rym

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

Deriving displacement as a function of time, constant acceleration and initial velocity More free lessons at: http://www.khanacademy.org/video?v=wlB0x

20) Plotting Projectile Displacement, Acceleration, and Velocity

Plotting projectile displacement, acceleration, and velocity as a function to change in time More free lessons at: http://www.khanacademy.org/video?v=T0zpF

21) Projectile Height Given Time

Figuring out how high a ball gets given how long it spends in the air More free lessons at: http://www.khanacademy.org/video?v=IYS4B

22) Deriving Max Projectile Displacement Given Time

Deriving a formula for maximum projectile displacement as a function of elapsed time More free lessons at: http://www.khanacademy.org/video?v=P7LKE

23) Impact Velocity From Given Height

Determining how fast something will be traveling upon impact when it is released from a given height More free lessons at: http://www.khanacademy.org/video?v=2ZgBJ

24) Visualizing Vectors in 2 Dimensions

Visualizing, adding and breaking down vectors in 2 dimensions More free lessons at: http://www.khanacademy.org/video?v=xp6ib

25) Projectile at an Angle

Figuring out the horizontal displacement for a projectile launched at an angle More free lessons at: http://www.khanacademy.org/video?v=ZZ39o

26) Different Way to Determine Time in Air

Another way to determine time in the air given an initial vertical velocity More free lessons at: http://www.khanacademy.org/video?v=_NWc3

27) Launching and Landing on Different Elevations

More complicated example involving launching and landing at different elevations More free lessons at: http://www.khanacademy.org/video?v=a5QnX

28) Total Displacement for Projectile

Reconstructing the total displacement vector for a projectile More free lessons at: http://www.khanacademy.org/video?v=UXORC

29) Total Final Velocity for Projectile

Calculating the total final velocity for a projectile landing at a different altitude (mistake near end: I write 29.03 when it should be 26.03 m/s and the final total magnitude should be 26.55 m/s 78. ...

30) Correction to Total Final Velocity for Projectile

Correction to "Total Final Velocity for Projectile" Video More free lessons at: http://www.khanacademy.org/video?v=DNoDJ

31) Projectile on an Incline

Challenging problem of a projectile on an inclined plane More free lessons at: http://www.khanacademy.org/video?v=jNESn

32) Unit Vectors and Engineering Notation

Using unit vectors to represent the components of a vector More free lessons at: http://www.khanacademy.org/video?v=2Qjdc

33) Optimal angle for a projectile part 1

34) Optimal angle for a projectile part 2 - Hangtime

Optimal angle for a projectile part 2 - Hangtime More free lessons at: http://www.khanacademy.org/video?v=XtAB9

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

Horizontal distance as a function of angle (and speed) More free lessons at: http://www.khanacademy.org/video?v=-h_x8

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

The force that keeps a block of ice from falling towards the center of the earth More free lessons at: http://www.khanacademy.org/video?v=1WOrg

38) Normal Force in an Elevator

How the normal force changes when an elevator accelerates More free lessons at: http://www.khanacademy.org/video?v=hoRsH

39) Inclined Plane Force Components

Figuring out the components of the force due to gravity that are parallel and perpendicular to the surface of an inclined plane More free lessons at: http://www.khanacademy.org/video?v=TC23w

40) Ice Accelerating Down an Incline

Figuring out the acceleration of ice down a plane made of ice More free lessons at: http://www.khanacademy.org/video?v=Mz2nD

41) Force of Friction Keeping the Block Stationary

Block of wood kept stationary by the force of friction (Correction made in next video) More free lessons at: http://www.khanacademy.org/video?v=v8ODI

42) Correction to Force of Friction Keeping the Block Stationary

Correction to Force of Friction Keeping the Block Stationary More free lessons at: http://www.khanacademy.org/video?v=BukTc

43) Force of Friction Keeping Velocity Constant

Calculating the coefficient of kinetic friction (correction made in next video) More free lessons at: http://www.khanacademy.org/video?v=iA7Th

44) Intuition on Static and Kinetic Friction Comparisons

Why static friction is harder to overcome than kinetic friction More free lessons at: http://www.khanacademy.org/video?v=J9BWN

45) Static and Kinetic Friction Example

Thinking about the coefficients of static and kinetic friction More free lessons at: http://www.khanacademy.org/video?v=ZA_D4

46) Introduction to Tension

An introduction to tension. Solving for the tension(s) in a set of wires when a weight is hanging from them. More free lessons at: http://www.khanacademy.org/video?v=_UrfH

47) Tension (part 2)

A slightly more difficult tension problem. More free lessons at: http://www.khanacademy.org/video?v=zwDJ1

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

The second part to the complicated problem. We figure out the tension in the wire connecting the two masses. Then we figure our how much we need to accelerate a pie for it to safely reach a man's f ...

49) Introduction to Momentum

What momentum is. A simple problem involving momentum. More free lessons at: http://www.khanacademy.org/video?v=XFhnt

50) Momentum: Ice skater throws a ball

A simple conservation of momentum problem involving an ice skater and a ball More free lessons at: http://www.khanacademy.org/video?v=vPkkC

51) 2-dimensional momentum problem

An example of conservation of momentum in two dimensions. More free lessons at: http://www.khanacademy.org/video?v=CFygK

52) 2-dimensional momentum problem (part 2)

We finish the 2-dimensional momentum problem More free lessons at: http://www.khanacademy.org/video?v=leudx

53) Introduction to work and energy

Introduction to work and energy More free lessons at: http://www.khanacademy.org/video?v=2WS1s

54) Work and Energy (part 2)

More on work. Introduction to Kinetic and Potential Energies. More free lessons at: http://www.khanacademy.org/video?v=3mier

55) Conservation of Energy

Using the law of conservation of energy to see how potential energy is converted into kinetic energy More free lessons at: http://www.khanacademy.org/video?v=kw_4L

56) Work/Energy problem with Friction

A conservation of energy problem where all of the energy is not conserved. More free lessons at: http://www.khanacademy.org/video?v=YvacY

57) Introduction to mechanical advantage

Introduction to simple machines, mechanical advantage and moments. More free lessons at: http://www.khanacademy.org/video?v=pfzJ-

58) Mechanical Advantage (part 2)

More on mechanical advantage, levers and moments. More free lessons at: http://www.khanacademy.org/video?v=DiBXx

59) Mechanical Advantage (part 3)

Introduction to pulleys and wedges More free lessons at: http://www.khanacademy.org/video?v=vSsK7

60) Center of Mass

Introduction to the center of mass More free lessons at: http://www.khanacademy.org/video?v=VrflZ

61) Introduction to Torque

An introduction to torque More free lessons at: http://www.khanacademy.org/video?v=QhuJn

62) Moments

Introduction to moments More free lessons at: http://www.khanacademy.org/video?v=ESusD

63) Moments (part 2)

2 more moment problems. More free lessons at: http://www.khanacademy.org/video?v=peXbz

64) Unit Vector Notation

Expressing a vector as the scaled sum of unit vectors More free lessons at: http://www.khanacademy.org/video?v=FaF3v

65) Unit Vector Notation (part 2)

More on unit vector notation. Showing that adding the x and y components of two vectors is equivalent to adding the vectors visually using the head-to-tail method More free lessons at: http://www.kh ...

66) Projectile Motion with Ordered Set Notation

Solving the second part to the projectile motion problem (with wind gust) using ordered set vector notation More free lessons at: http://www.khanacademy.org/video?v=jl_gQ

67) Centripetal Force and Acceleration Intuition

The direction of the force in cases of circular motion at constant speeds More free lessons at: http://www.khanacademy.org/video?v=vZOk8

68) Visual Understanding of Centripetal Acceleration Formula

Visual understanding of how centripetal acceleration relates to velocity and radius More free lessons at: http://www.khanacademy.org/video?v=NH1_s

69) Relationship between angular velocity and speed

How angular velocity relates to speed More free lessons at: http://www.khanacademy.org/video?v=zAx61

70) Calculus proof of centripetal acceleration formula

Proving that a = v^2/r More free lessons at: http://www.khanacademy.org/video?v=XjCEu

71) Loop De Loop Question

Asks students to find the minimum speed necessary to complete the loop de loop More free lessons at: http://www.khanacademy.org/video?v=wjZb3

72) Loop De Loop Answer part 1

Figuring out the minimum speed at the top of the loop de loop to stay on the track More free lessons at: http://www.khanacademy.org/video?v=4SQDy

73) Loop De Loop Answer part 2

Figuring out the car's average speed while completing the loop de loop More free lessons at: http://www.khanacademy.org/video?v=zcnnZ

74) Acceleration Due to Gravity at the Space Station

What is the acceleration due to gravity at the space station More free lessons at: http://www.khanacademy.org/video?v=R5CRZ

75) Space Station Speed in Orbit

Speed necessary for the space station to stay in orbit More free lessons at: http://www.khanacademy.org/video?v=9BNkm

76) Conservation of angular momemtum

Angular momentum is constant when there is no net torque. More free lessons at: http://www.khanacademy.org/video?v=s_R8d

77) Introduction to Newton's Law of Gravitation

A little bit on gravity More free lessons at: http://www.khanacademy.org/video?v=391tx

78) Gravitation (part 2)

A little bit more on gravity More free lessons at: http://www.khanacademy.org/video?v=8i0j3

79) Intro to springs and Hooke's Law

Introduction to Hooke's Law More free lessons at: http://www.khanacademy.org/video?v=ZzwuH

80) Potential energy stored in a spring

Work needed to compress a spring is the same thing as the potential energy stored in the compressed spring. More free lessons at: http://www.khanacademy.org/video?v=eVl5z

81) Spring potential energy example (mistake in math)

A spring, a frozen loop-d-loop and more! (See if you can find the mistake I made and get the right answer!) More free lessons at: http://www.khanacademy.org/video?v=P3QV9

82) Introduction to Harmonic Motion

Intuition behind the motion of a mass on a spring (some calculus near the end). More free lessons at: http://www.khanacademy.org/video?v=Nk2q-

83) Harmonic Motion Part 2 (calculus)

We test whether Acos(wt) can describe the motion of the mass on a spring by substituting into the differential equation F=-kx More free lessons at: http://www.khanacademy.org/video?v=xoUpp

84) Harmonic Motion Part 3 (no calculus)

Figuring out the period, frequency, and amplitude of the harmonic motion of a mass attached to a spring. More free lessons at: http://www.khanacademy.org/video?v=oqBHB

85) Fluids (part 1)

What a fluid is. Difference between liquids and gasses (both fluids). More free lessons at: http://www.khanacademy.org/video?v=Pn5YE

86) Fluids (part 2)

Pressure and Pascal's Principal. More free lessons at: http://www.khanacademy.org/video?v=lWDtF

87) Fluids (part 3)

Pressure in a fluid at depth More free lessons at: http://www.khanacademy.org/video?v=5EWjl

88) Fluids (part 4)

Using our understanding of fluid pressure to figure out the height of a column of mercury. More free lessons at: http://www.khanacademy.org/video?v=i6gz9

89) Fluids (part 5)

Introduction to Archimedes' principle and buoyant force. More free lessons at: http://www.khanacademy.org/video?v=vzID7

90) Fluids (part 6)

A couple of problems involving Archimedes' principle and buoyant forces. More free lessons at: http://www.khanacademy.org/video?v=wwjtu

91) Fluids (part 7)

Introduction to the study of moving fluids. More free lessons at: http://www.khanacademy.org/video?v=G4CgO

92) Fluids (part 8)

Beginning of the proof of Bernoulli's Equation. More free lessons at: http://www.khanacademy.org/video?v=uqyLO

93) Fluids (part 9)

Second part of the Bernoulli's Equation proof. Beginning of a problem that uses the equation. More free lessons at: http://www.khanacademy.org/video?v=QX2YL

94) Fluids (part 10)

Second part of the example that uses Bernoulli's equation. More free lessons at: http://www.khanacademy.org/video?v=NGpJP

95) Fluids (part 11)

Clarification of the problem in part 10 More free lessons at: http://www.khanacademy.org/video?v=HnfBF

96) Fluids (part 12)

Complete example of a Bernoulli's Equation exercise. More free lessons at: http://www.khanacademy.org/video?v=xlJYY

97) Thermodynamics (part 1)

Intuition of how gases generate pressure in a container and why pressure x volume is proportional to the combined kinetic energy of the molecules in the volume. More free lessons at: http://www.khana ...

98) Thermodynamics (part 2)

Example problem that pv=pv. Introduction to temperature. More free lessons at: http://www.khanacademy.org/video?v=x34OT

99) Thermodynamics (part 3)

Introduction to Kelvin. Example of a problem involving the ideal gas law More free lessons at: http://www.khanacademy.org/video?v=HvYUK

100) Thermodynamics (part 4)

Introduction to the concept of a mole. Universal gas constant R. PV=nRT More free lessons at: http://www.khanacademy.org/video?v=5B1i2