phy lab rep 2.1 linear airtrack
Post on 27-Nov-2015
263 Views
Preview:
DESCRIPTION
TRANSCRIPT
PHYSICS LABORATORY REPORT
EXPERIMENT 2.1 : MOTION DUE TO STEADY FORCE USING LINEAR
AIR TRACK
NAME : NURAINA SAKINA BINTI ZAKRI
NRIC : 951010-11-5076
GROUP : 11SC2
STUDENT ID : 1311171218
DATE :
LECTURER : MR MOHD AZUAN BIN MOHD AZLAN
1
INTRODUCTION
In this experiment we verified Newton’s Second Law by measuring the acceleration of
a system subject to a net external force. Newton’s second law states that the acceleration a of
an object is directly proportional to the net force acting on the object and inversely
proportional to the object’s mass m.
Newton’s second law can be expressed as an equation using F = ma. The unbalanced
force was supplied by a mass falling in the earth’s gravitational field. Mass M rested on a
smooth horizontal air track and was attached to mass m by a light tape passing over a pulley.
When the system was released M was pulled along the track by the force supplied by the
suspended mass m. The air track and pulley had small openings through which jets of air
were ejected to create a nearly frictionless surface. The two masses were connected by a very
light recording tape on which marks are made every 1/60 second by a spark timer.
We ignored the friction in the pulley as well as the friction between the mass and the air
track. Also, the mass of the string was assumed to be negligible. With these assumptions
Newton’s second law was able to be proved by calculations.
OBJECTIVE
To measure velocity and acceleration of a glider using a light gate and LAT
APPARATUS/EQUIPMENT
Air track, air supply, two cards, two light gates, thread, pulley and slotted mass
2
PROCEDURE
1. The distance between light gate A and B is measured
2. A 100g mass is attached to the mass holder
3. The air track is switched on and the card on the glider is checked whether it passes
through the gates without touching them
4. The length of the cars is measured and the times shown for gate A and B is recorded
5. The positions of the light gates are changed (eg 30cm and 80 cm) and the
corresponding times are measured
6. The readings are recorded in the table of results.
ASSUMPTIONS
1. It is assumed that the air track is totally frictionless.
2. It is assumed that the glider accelerates due to gravity only
3. Mass of string is neglible
3
RESULTS
Length of card = 14.4 cm
Position of
light gate A
(cm)
Time t1
(s)
Velocity at
A
(ms-1)
Position at
light gate B
(cm)
Time t2
(s)
Velocity at
B
(ms-1)
Acceleration
(ms-2)
a = v2 - u2
2s
30 0.1525 0.9443 80 0.0848 1.6981 0.0199
40 0.1323 1.0884 90 0.0909 1.5841 0.0132
50 0.1205 1.1950 100 0.1005 1.4328 0.0063
60 0.1004 1.4343 110 0.0967 1.4891 0.0016
DISCUSSION
1. If the glider is attached to a ticker tape timer, how the dots on the timer will look on
the tape for the above motion? Draw the dots
- The separation between the dots increases
- The velocity increases
- The object is accelerating
CONCLUSION
Objective achieved. For a constant mass, the acceleration is proportional to the applied force
4
top related