Alternatively, force applied to an object can be measured and the mass of an object can be measured. Of course speed is derived from the measurement of the separation of two locations (distance) divided by the time required to travel between those to locations. how fast (usually m/s) was the object going 1 time-unit (usually 1 second) ago and how fast is it going now, take the difference in speed and divide by the time unit ( m/s / s = m/s^2 ). It is always DERIVED from at least two other measurements, i.e. This leads to an interesting observation: acceleration CANNOT be measured directly.
If the table were removed gravity would CAUSE acceleration and the force acting on the internal mechanism would now be equal to the force acting on the exterior of the Wiimote (the UPWARD force applied by the table is gone) so the measuring mechanism would have no DIFFERENCE in forces to measure.Īnyone who took college level physics can probably recall that their prof probably joked about deriving the “meaning of life” from While lying still on the table, the object is not changing direction or speed, it is merely being acted upon by gravity. As others have noted, acceleration BY DEFINITION is the rate of change of the speed of an object, or speed (distance/time) change per unit of time (1/time). The device does not know whether it is near an object that has a strong enough gravitation field to exert that force or whether it is “free floating” in space and being accelerated by a rocket motor (see F=ma below). The third axis experiences the force of gravity which the device translates as acceleration. When the Wiimote is lying flat on a table, two axes experience no force being applied. Yes, they are called “ACCELERometers” but what do they ACTUALLY measure (meter)? They actually measure the FORCE excerted by whatever outside source is acting on the device, whether that force be gravity or a “change in speed/direction” (which manifest themselves identically).
Post # 2 (chris), 11 (…), 18 (grim_factor) : sorry guys, but you are the ones who are incorrect.
0 kommentar(er)
