A New Method to Measure Gravity: Using Floating Atoms

A team of researchers at the University of California at Berkeley found a new way to measure gravity by noting differences in atoms in a s...

Instantaneous Velocity and Speed - Motion in One Dimension

We often need to know the velocity of a particle at a given moment, rather than the average velocity over a finite time interval. For exa...

Position, Velocity and Acceleration Vectors - A Simple Way

Kinematics is the part of mechanics that describes the movement of particles, objects or groups of objects. In these pages, we will analy...

Matter and Model Building, Density and Atomic Mass

Matter and Model Building If physicists can not interact directly with a phenomenon, they often imagine a model for a physical system...

Physics and Measurement - Standarts of Length, Mass, and Time

1.1 What is Physics Science and engineering are based on measurements and comparisons.  Thus, we need rules about how things are measu...