Where physics meets philosophy... There is another view on the relativity of time:
Growing older is mandatory.
Growing up is optional.Just a thought dedicated to my students.
Relativity of Time
Torque
The picture above shows two masses in an equilibrium. Physicists see this situation through the lenses of forces and their respective arms (an arm is the distance from pivot point to the point where the force is exerted).
counterclockwise torque (the left side) = 26 cm * 100 g = 2600 cm*g
clockwise torque (the right side) = 13 cm * 200 g = 2600 cm*g
Accelerated motion
The time of glider passing between photogates is measured with high accuracy (0.001 s).
The same video in low motion:
Distance in accelerated motion
The air track is elevated (see its right leg in the picture), so the observed motion is accelerated due to gravity. Two photogates allow to measure the time needed to move between them with high accuracy. In our experiment the second photogate was placed each time 10 cm farther to the left (see the data below).
(Graph by Tim)
Speed in accelerated motion
The glider blocks the photogate passing through. If the glider's flag is 10 cm long and the measured time is 0.214, then the speed of the glider is
v = l / t
v = 0.1 m / 0.2157 s = 0.4636 m/s
Once again, now in slow motion:
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