21. The simplest actuator is purely mechanical, where linear motion in one direction gives rise to rotation. 22. One may compare linear motion to general motion. 23. Rotation of the jack handle is converted mechanically into the linear motion of the jack head. 24. This is what gives us the linear motion , " high G " shaking of the basket. 25. Innovative granite chassis, combined with linear motion technologies, are used to improve probing precision and test speed. 26. :I found it helpful to say " in linear motion the concept of mass is very important. 27. Do you want reciprocating ( back and forth ) linear motion or movement in one direction only? 28. :Linear motion is relative-you can only detect it by comparing to something else, but circular motion is not. 29. To produce the proper Linear motion a second, counter rotating, vibrator is added in parallel to the first. 30. The electric current equation can be viewed as a convective current of electric charge that involves linear motion .