External electric fields have been used to control the motion of small objects through electrostatic repulsion. Here, electric fields are used to polarize conducting objects, triggering their ...

The vertical circle is housed within the wood and glass box, graduated to about 15 minutes, and read by opposite magnifiers. The horizontal circle is graduated and read by vernier.

Newton's first law can also be used to explain the movement of objects travelling with non-uniform motion. This includes situations when the speed changes, the direction changes, or both change.