AS physics unit 3 revision notes (prt 3 - mechanics experiments)

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Preview of AS physics unit 3 revision notes (prt 3 - mechanics experiments)

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PHYSICS
EXPERIMENTS
(MECHANICS)
`In the matter of physics, the first lessons should contain
nothing but what is experimental and interesting to see. A
pretty experiment is in itself often more valuable than twenty
formulae extracted from our minds.' - Albert Einstein
www.psi-net.org
1

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LEAVING CERTIFICATE PHYSICS
LISTED EXPERIMENTS
CONTENTS
MECHANICS
Measurement of velocity ..................................................................................................... 4
and acceleration .......................................................................... 6
To show that a F.............................................................................................................. 8
Verification of the principle of conservation of momentum ........................................... 10
Measurement of g.............................................................................................................. 12
Verification of Boyle's law ............................................................................................... 14
Investigation of the laws of equilibrium for a set of co-planar forces............................ 16
Investigation of the relationship between period and length for a simple pendulum and
hence calculation of g* .....................................................................................................…read more

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NOTE
For examination purposes any valid method will be acceptable for describing a particular
experiment unless the syllabus specifies a particular method in a given case.
Students will be expected to give details of equipment used, assembly of equipment, data
collection, data manipulation including graphs where relevant. Students will also be
expected to know the conclusion or result of an experiment and appropriate precautions.
SAFETY
1.…read more

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MEASUREMENT OF VELOCITY
Apparatus
Ticker timer and tape, suitable low-voltage a.c. power supply, trolley, runway, laboratory
jack or stand.
Ticker tape Ticker timer Trolley
Runway
Procedure
1. Set up the apparatus as in the diagram.
2. Connect the ticker timer to a low-voltage power supply.
3. Give the trolley a small push to start it moving.
4. Adjust the angle of inclination of the runway until the trolley moves with
constant velocity ­ the spots on the tape are all equidistant.
5.…read more

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Notes
Ignore the initial five or six dots on the tape as this shows the initial acceleration due to
the push.
Ticker timers that use precarbonated tape are recommended because the friction due to
paper drag is reduced.
Ensure that the voltage rating of the timer is not exceeded.
Some timers make one hundred dots in one second.…read more

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MEASUREMENT OF ACCELERATION
Apparatus
Ticker timer and tape, suitable low-voltage a.c. power supply, dynamics trolley, runway
and laboratory jack or stand.
Ticker tape Ticker timer
Trolley Runway
Procedure
1. Set up the apparatus as in the diagram.
2. Connect the ticker timer to a suitable low-voltage power supply.
3. Allow the trolley to roll down the runway.
4. The trolley is accelerating as the distance between the spots is increasing.
.. . . . . . . . . . . . . .
5.…read more

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Results
s1/m t1/s u/m s-1 s2/m t2/s v/m s-1 t/s a/m s-2
Notes
Ignore the initial five or six dots on the tape since the trolley may not be moving with
constant acceleration during this time interval.
Ticker timers that use precarbonated tape are recommended because the friction due to
paper drag is reduced.
Ensure that the voltage rating of the timer is not exceeded.
Some timers make one hundred dots in one second.…read more

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TO SHOW THAT a F
Apparatus
Air-track with one vehicle, pulley and blower, two photogates, two retort stands, dual
timer, metre-stick, black card, set of slotted weights (1 N total).
Dual timer
t1 t2
Photogate
l Pulley
Light beam Card
Slotted
weights
s
Air track
Procedure
1. Set up the apparatus as in the diagram. Make sure the card cuts both light beams
as it passes along the track.
2. Level the air track.
3. Set the weights F at 1 N.…read more

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Results
l = .......... m.
s = .......... m.
l
Initial velocity u =
t1
l
Final velocity v =
t2
v2 - u2
Acceleration a =
2s
F/N t1/s t2 /s u/m s-1 v/m s-1 a/m s-2
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Conclusion
A straight line through the origin shows that, for a constant mass, the acceleration is
proportional to the applied force.
Notes
The total accelerating mass must be kept constant; hence the need to transfer the masses.…read more

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VERIFICATION OF THE PRINCIPLE OF CONSERVATION OF
MOMENTUM
Apparatus
Linear air-track, two vehicles with velcro pads attached, blower, two photogates, two
retort stands, dual timer, metre-stick, black card.
Dual timer
t1 t2
Photogate
Light beam
l Card
Air track
Vehicle 1 Velcro pad Vehicle 2
Procedure
1. Set up apparatus as in the diagram.
2. Connect air-track to blower.
3. Level the air-track.
4. Measure the mass of each vehicle m1 and m2 respectively, including attachments,
using a balance.
5.…read more

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