Gravity is, at heart, a mystery. Yes, we can talk about curvature of space-time and perhaps make analogies with stretched rubber sheets. But we don’t know why mass causes space-time to curve. To put ...

Along with gravimeters and torsion balances, pendulums can be used to measure gravitational force. The period oscillation of the pendulum can be used to measure gravitational acceleration, and in turn ...

The "Edward Kübel, Washington" inscription suggests that this pendulum was made between 1875, when Kübel began in business, and his death in 1896. The form is similar to that designed by the English ...

Introduction Did you know that playground swings can provide a good lesson in physics—as well as lots of fun? The back-and-forth motion of a swing is an example of a pendulum. We see pendulums in ...