Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I ...

1.1 What is friction? Take this everyday example: when a coffee mug rests on a flat table, the kinetic frictional force is zero. There is no force trying to move the mug across the table, so there is ...

As a result of the work done by this friction, the kinetic energy of the disk decreases. This is shown in the initial stage of the animation shown below. As the disk continues to roll with slipping, ...

When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy. Friction can sometimes be useful. For example, we rely on the soles of ...

That's more like it! How come you’re going so much faster now? There's less friction between the snow and the skis than there was between the road and the skis because snow is a smoother surface?