Go Math Science

by Dr. Osama M. Khaled — published Jun 22, 2026 — last modified Jun 22, 2026 04:34 AM

Swing a simple, damped, or double pendulum -adjust length, gravity, and damping, then watch the period, energy, and angle-vs-time curve update live.

Located in Tools / Physics Tools

Pendulum swinging with no air friction

by Dr. Osama M. Khaled — published Jul 05, 2023 — last modified Jul 09, 2023 07:08 PM Located in Physics / Momentum and Energy Conservation / Energy Conservation

pendulum.gif

by Dr. Osama M. Khaled — last modified Jul 02, 2023 10:29 PM Located in Physics / … / Potential Energy / Pendulum

pendulumfromA.gif

by Dr. Osama M. Khaled — last modified May 27, 2024 02:25 AM Located in Physics / … / Kinetic Energy / Pendulum in motion

Percent

by Dr. Osama M. Khaled — published Jun 18, 2022 — last modified Dec 14, 2025 04:57 AM

Learn about percent and how to use them in real life situations.

Located in Mathematics / Basic Arithmetic

Percent as a fraction

by Dr. Osama M. Khaled — published Oct 22, 2022 — last modified Jul 03, 2025 12:29 PM Located in Mathematics / … / Percents, Decimals, and Fractions / Meaning of a percent

Percent Definitions

by Dr. Osama M. Khaled — published Jul 18, 2024 Located in Mathematics / … / Solving Percent Problems Using Percent Equations and Proportions / Solve percent equations to find the amount

Percent Equation

by Dr. Osama M. Khaled — published Jul 18, 2024 Located in Mathematics / … / Solving Percent Problems Using Percent Equations and Proportions / Solve percent equations to find the amount

percent_sqaures_more_than_100.jpg

by Dr. Osama M. Khaled — last modified Jul 15, 2024 08:49 PM Located in Mathematics / … / Meaning of a percent / What is the percent of the shaded squares in the below boxes

$percent_sqaures_more_than_100.jpg$

percent_squares.jpg

by Dr. Osama M. Khaled — last modified Jul 15, 2024 08:49 PM Located in Mathematics / … / Meaning of a percent / In the below figure there are 100 squares and 93 of them are shaded

$percent_squares.jpg$

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