Physical Pendulum - Revision history

Ist12916: /* Protocol */

2019-03-04T11:57:08Z

Protocol

Ist12916: /* Experimental Apparatus */

2019-03-04T11:56:36Z

Experimental Apparatus

Ist12916 at 08:10, 28 February 2019

2019-02-28T08:10:35Z

Ist12916: /* Experiment Description */

2019-02-28T08:07:32Z

Experiment Description

Ist12916: /* Experiment Description */

2019-02-27T14:15:41Z

Experiment Description

Ist12916: /* Experiment Description */

2019-02-26T18:12:51Z

Experiment Description

Ist12916: /* Links */

2019-02-26T17:45:10Z

Links

Ist12916: /* Experimental Apparatus */

2019-02-26T17:40:59Z

Experimental Apparatus

Ist12916 at 17:30, 26 February 2019

2019-02-26T17:30:20Z

Ist12916: Created page with "=Experiment Description= A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure..."

2019-02-26T17:11:37Z

Created page with "=Experiment Description= A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure..."

New page

=Experiment Description=
A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass whose position can vary from mm up to.

The purpose of this experiment is to verify how the pendulum's motion varies with the length between the fulcrum and the mass position.

<div class="toccolours mw-collapsible mw-collapsed" style="width:420px">
'''Links'''
<div class="mw-collapsible-content">

*Video: rtsp://elabmc.ist.utl.pt/.sdp
*Laboratory: Basic in e-lab.ist.eu[http://e-lab.ist.eu]
*Control room: Mola
*Grade: *

</div>
</div>

=Experimental Apparatus=

This control room allows to study the oscillations of a damped pendulum as well as to determine the constant of friction that acts on its oscillatory movement.
The experiment allows the pendulum to be launched from different initial angular positions and it is possible to choose the length of the pendulum rod and the sample rate to an upper time of 10 s. At the top of the pendulum rod is attached a magnetic head of a conventional hard disk that allows determining the angular position of the pendulum as over time and inferre the velocity by calculating its differential.

The apparatus is composed by a servo motor capable of compress or extend a spring by means of a rod. The spring distension is exactly measured by a potentiometer while the force is detected by a pressure gauge on top of the spring.

[[File:mola-montagem.jpg|thumb|alt=Experimental setup|Setup]]

The spring has 37.2 mm of which 10.0 mm are compressed windings (two sets of 14 windings). This means that the working length of the spring varies from 23.1 mm on compression to 32.4 on distension.

It is possible to choose the compression/expansion limits of the spring and the velocity to detect possible hysteresis effects.

=Protocol=
The user must specify the initial and final servo positions, the number of samples, the time interval between them and the number of cycles to execute (i.e. several compressions and/or distensions). This last option indirectly defines the speed at which the experiment occurs.

[[File:SpringForce.PNG|thumb|Adjusting two lines is needed to fit the hole experiment characteristic.]]

=Links=
[https://en.wikipedia.org/wiki/Hooke's_law wikipedia]
*[[Lei de Hooke| Portuguese version (Versão em Português)]]

@@ Line 48: / Line 48: @@
 =Protocol=
-The user must specify the mass position, the number of samples, the frequency between them and the initial angle. This last option indirectly defines the speed at which the experiment occurs.
+The user must specify the bob's position, the number of samples, the frequency between them and the initial angle. This last option indirectly defines the speed at which the experiment occurs.
 =Links=
 *[[Pêndulo de Haste Rígida| Portuguese version (Versão em Português)]]

@@ Line 21: / Line 21: @@
 =Experimental Apparatus=
+==Description==
 [[File:PromenorSensorPenduloGravitico.png|thumb | Detail of the angular diferential sensor position based on hard-disk coils]]
@@ Line 30: / Line 30: @@
 The experiment allows the pendulum to be launched from different initial angular positions and it is possible to choose the length of the pendulum rod and the sample rate to an upper time of 10 s. At the top of the pendulum rod is attached a magnetic head of a conventional hard disk that allows determining the angular position of the pendulum over time and infer the velocity by calculating its differential.
-The apparatus is composed by a servo motor to position the bob over the a rod and another servo for the initial displacement induced to "launch" the experiment.
+* Variable length between 141 and 208 mm.
 =Protocol=

@@ Line 24: / Line 24: @@
 [[File:PromenorSensorPenduloGravitico.png|thumb | Detail of the angular diferential sensor position based on hard-disk coils]]
-This experiment consists on a pendulum composed by a variable position mass along a rigid rod. The pendulum's mass slides on the rod and it's possible to define the height of the mass over the rod. It's also possible to define the initial angle and the frequency for the acquisitions (sample rate) as the pendulum oscillates.
+This experiment consists on a pendulum composed by a variable position mass along a rigid rod. The pendulum's bob slides on the rod and it's possible to define the height of the mass over the rod. It's also possible to define the initial angle and the frequency for the acquisitions (sample rate) as the pendulum oscillates.
 Historically pendulums are used since about the year 1600 and it's discovery and first studies are assigned to Galileo Galilei. Its regular oscillation allows it to be used to measure time quite accurately until very recently, and the fine tuning of its length allowed for regulating pendulum clocks very precisely. Pendulums were also used to perform the first measurements of the acceleration of gravity.
@@ Line 31: / Line 31: @@
-The apparatus is composed by a servo motor to position the mass over the a rod and another servo for the initial displacement.
+The apparatus is composed by a servo motor to position the bob over the a rod and another servo for the initial displacement induced to "launch" the experiment.
 =Protocol=

@@ Line 1: / Line 1: @@
 =Experiment Description=
-[[File: PenduloGravitico.png| thumb | Physical pendulum made up of a rigid shaft and a mass that can slide in height]]
+[[File: PenduloGravitico.png| thumb | Physical pendulum made up of a rigid shaft and a bob that can slide in height]]
-A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass whose position can vary from 152mm to 248mm.
+A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass (bob) whose position can vary from 152mm to 248mm.
-The purpose of this experiment is to verify how the pendulum's motion varies with the length between the fulcrum and the mass position and its damped factor according to the initial displacement (the same is to say the initial energy).
+The purpose of this experiment is to verify how the pendulum's motion varies with the length between the fulcrum and the bob position and its damped factor according to the initial displacement (the same is to say the initial energy).

← Older revision		Revision as of 14:15, 27 February 2019
Line 1:		Line 1:
	=Experiment Description=		=Experiment Description=
		+
		+	[[File: PenduloGravitico.png\| thumb \| Physical pendulum made up of a rigid shaft and a mass that can slide in height]]
		+
	A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass whose position can vary from 152mm to 248mm.		A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass whose position can vary from 152mm to 248mm.

@@ Line 10: / Line 10: @@
 *Video: rtsp://elabmc.ist.utl.pt/pendulogravitico.sdp
-*Laboratory: Basic in e-lab.ist.eu[http://e-lab.ist.eu]
+*Laboratory: Basic in e-lab.ist.utl.pt[http://e-lab.ist.utl.pt]
 *Control room: Gravity Pendulum
 *Grade: *
@@ Line 16: / Line 16: @@
 </div>
 </div>
 =Experimental Apparatus=

← Older revision		Revision as of 17:45, 26 February 2019
Line 35:		Line 35:

	=Links=		=Links=
−	~~Página~~ em Português	+	*[[Pêndulo de Haste Rígida\| Portuguese version (Versão em Português)]]

@@ Line 1: / Line 1: @@
 =Experiment Description=
-A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass whose position can vary from mm up to.
+A physical pendulum consists of a rigid body that undergoes fixed axis rotation about a fixed point. In the present case it has a rigid rod structure and a mass whose position can vary from 152mm to 248mm.
-The purpose of this experiment is to verify how the pendulum's motion varies with the length between the fulcrum and the mass position.
+The purpose of this experiment is to verify how the pendulum's motion varies with the length between the fulcrum and the mass position and its damped factor according to the initial displacement (the same is to say the initial energy).
@@ Line 9: / Line 9: @@
 <div class="mw-collapsible-content">
-*Video: rtsp://elabmc.ist.utl.pt/.sdp
+*Video: rtsp://elabmc.ist.utl.pt/pendulogravitico.sdp
 *Laboratory: Basic in e-lab.ist.eu[http://e-lab.ist.eu]
-*Control room: Mola
+*Control room: Gravity Pendulum
 *Grade: *
@@ Line 20: / Line 20: @@
 =Experimental Apparatus=
-This control room allows to study the oscillations of a damped pendulum as well as to determine the constant of friction that acts on its oscillatory movement.
+This experiment consists on a pendulum composed by a variable position mass along a rigid rod. The pendulum's mass slides on the rod and it's possible to define the height of the mass over the rod. It's also possible to define the initial angle and the frequency for the acquisitions (sample rate) as the pendulum oscillates.
-The apparatus is composed by a servo motor capable of compress or extend a spring by means of a rod. The spring distension is exactly measured by a potentiometer while the force is detected by a pressure gauge on top of the spring.
+The experiment allows the pendulum to be launched from different initial angular positions and it is possible to choose the length of the pendulum rod and the sample rate to an upper time of 10 s. At the top of the pendulum rod is attached a magnetic head of a conventional hard disk that allows determining the angular position of the pendulum over time and infer the velocity by calculating its differential.
-The spring has 37.2 mm of which 10.0 mm are compressed windings (two sets of 14 windings). This means that the working length of the spring varies from 23.1 mm on compression to 32.4 on distension.
+The apparatus is composed by a servo motor to position the mass over the a rod and another servo for the initial displacement.
-It is possible to choose the compression/expansion limits of the spring and the velocity to detect possible hysteresis effects.
+[[File:mola-montagem.jpg|thumb|alt=Experimental setup|Setup]]
 =Protocol=
-The user must specify the initial and final servo positions, the number of samples, the time interval between them and the number of cycles to execute (i.e. several compressions and/or distensions). This last option indirectly defines the speed at which the experiment occurs.
+The user must specify the mass position, the number of samples, the frequency between them and the initial angle. This last option indirectly defines the speed at which the experiment occurs.
 =Links=
-[https://en.wikipedia.org/wiki/Hooke's_law wikipedia]
+Página em Português