DrOfEng

This AP Physics C (Mechanics) video derives an equation for the centripetal (centre-seeking) acceleration for the special case of uniform circular motion. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video covers a worked example on truth tables. Post your comments/questions below and please subscribe.

This AP Chemistry video explains how ionic compounds are formed and the number of charges gained or lost based on the groups of the elements in the periodic table. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video provides a worked example on how to determine if a function is differentiable. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video covers a worked example on air drag, a type of resistive force that depends on the velocity of a body. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video covers truth tables, which are useful to prove Boolean identities, and break down and simplify complex Boolean expressions. Post your comments/questions below and please subscribe.

This AP Chemistry video covers worked examples on periodic trends in the periodic table. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video demonstrates how to determine if a function is differentiable. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video defines two models for air drag (resistive force) and also terminal velocity, and derives the ODE that accounts for air drag using Newton's Second Law. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video covers worked examples on De Morgan's laws. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the periodic trend in electronegativity using the periodic table, which is the ability of an atom to attract an electron from another atom to form a chemical bond. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video demonstrates how to estimate the derivative of a function at a point using technology. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video covers worked examples on cable and pulley systems. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video explains De Morgan's laws and equivalent boolean expressions. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the periodic trend in electron affinity using the periodic table, which is the energy released when an electron is attached to an atom to form an anion. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video demonstrates how to estimate the derivative of a function at a point using tables and graphs. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video covers a worked example on cable and pulley systems. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video covers worked examples on if statements and boolean expressions. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the periodic trend in ionic radius using the periodic table, and compares the atomic radii and ionic radii of atoms and ions. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video demonstrates how to represent the derivative graphically, numerically, analytically and verbally. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation - Definition and Fundamental Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video covers a worked example on cable and pulley systems. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Computer Science A video explains compound boolean expressions and nested if statements. Post your comments/questions below and please subscribe.

This AP Chemistry video explains the periodic trend in atomic radius using the periodic table. This video is part of Unit 1 of AP Chemistry on Atomic Structure and Properties. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Calculus AB/BC video covers worked examples on using the definition of the derivative. This video is part of Unit 2 of AP Calculus AB/BC on Differentiation (Definition and Fundamental Properties). You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.

This AP Physics C (Mechanics) video explains how to analyse the motion of an Atwood Machine, which is a special type of massless cable and pulley system. This video is part of Unit 2 of AP Physics C (Mechanics) on Newton's Laws of Motion. You can contact me through the comments and community section, or email me at drofeng@gmail.com for questions.