When you let go of the raised bob,
its potential energy is converted to kinetic energy as it swings down with increasing speed, and then back to potential energy as it swings up on the other side with decreasing speed
.
When pendulum bob swings back and forth?
For the pendulum, the bob moves back and forth. This back and forth motion is called “
oscillation
.” Its position is said to oscillate back and forth. The period is the amount of time it takes the bob to make one round trip.
What does it mean when a pendulum swings back and forth?
As the pendulum swings back and forth,
the balance between the two types of energy changes constantly
. At some points in its swing, the pendulum has more kinetic energy. At other points, it has more potential energy. Of course, no working system is ideal.
What force does no work on a pendulum?
Tension
is an external force and if it did do work upon the pendulum bob it would indeed serve to change the total mechanical energy of the bob. However, the force of tension does not do work since it always acts in a direction perpendicular to the motion of the bob.
Is it better to start and stop the stopwatch at the end of the swing or at the center?
Notes on measuring period. Start the stopwatch as the weight crosses through the bottom of its swing,
stop it also at the bottom of its swing after it
has gone through one oscillation. … You can make make accurate measurements by timing ten swings of the pendulum.
What causes a pendulum to slow down and stop swinging?
When the swing is raised and released, it will move freely back and forth due to the force of gravity on it. The swing continues moving back and forth without any extra outside help until
friction
(between the air and the swing and between the chains and the attachment points) slows it down and eventually stops it.
Why does a pendulum keep swinging?
Function. The science behind the pendulum is explained through the
forces of gravity and inertia
. The Earth’s gravity attracts the pendulum. … This swinging-back-and-forth force continues until the force that started the movement is not stronger than gravity, and then the pendulum is at rest again.
How do you tell if a pendulum is saying yes or no?
Here’s an example of how to program the “yes” signal: Holding the pendulum in position, say
“When I ask a question and the answer is yes, move like this, in a clockwise circle
.” (or whatever signal you’ve chose for “yes”).
What point the Bob moves faster?
A pendulum bob will move fastest
when the mass is at its lowest point (when x=0)
. The reason for this is that in the pendulum system energy is transferred between kinetic and gravitational potential energy, and total energy will always be fixed in the system.
Where does energy go when a pendulum stops swinging?
When the pendulum stops briefly at the top of its swing, the
kinetic energy is zero
, and all the energy of the system is in potential energy. When the pendulum swings back down, the potential energy is converted back into kinetic energy. The truly conserved quantity is the sum of kinetic, potential, and thermal energy.
What is the period of the pendulum that is what is the time for one swing back and forth?
A cycle
is one complete back-and-forth motion. The period is the time it takes to complete one full cycle. The period of a pendulum is the time it takes for the pendulum to swing from left to right and back again. The amplitude describes the size of the cycle.
What is the restoring force of a pendulum?
As for the simple pendulum, the restoring force of the physical pendulum is
the force of gravity
. With the simple pendulum, the force of gravity acts on the center of the pendulum bob. In the case of the physical pendulum, the force of gravity acts on the center of mass (CM) of an object.
What are some variables you can think of that could change how fast the pendulum will swing?
The variable to change is
the length of the string
. This is the only variable (that we can easily change) that affects the period of a pendulum. The longer the string, the more time it takes for the pendulum to go through one swing.
What is the human error when using a stopwatch?
Question: Time intervals measured with a stopwatch typically have an uncertainty of
about 0.2 s
, due to human reaction time at the start and stop moments.
How would you most accurately time one swing of a pendulum?
A simple way to measure the pendulum’s period fairly precisely is to start the pendulum swinging, and measure the time required for a large number of FULL swings – 40, 50, or so. Choose the number of swings so that the total time for the measurement is
40 seconds or more
.
How can you increase the reliability of a pendulum experiment?
- making timings by sighting the bob past a fixed reference point (called a fiducial point )
- sighting the bob as it moves fastest past a reference point. The pendulum swings fastest at its lowest point and slowest at the top of each swing.
