If I were to set my chair on top of my desk, it would be dangerous, as well as inconvenient. If I were to sit in my chair while it was set on my desk, it would be inconvenient and even more dangerous.

Suppose we consider the incline to be smooth. In this case, there is no work done on the system by non-conservative forces. Consider the simulation results below of the block sliding on a smooth ...

We walk here, we walk there, we walk everywhere. Maybe you’re headed to work or to lunch in a busy city. You’re expending energy, and the exercise is good for you. But what if, on top of that, we ...