Dynamics

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DEPARTMENT ENGINEERING
DESIGN AND MANUFACTURE

LABORATORY REPORT

LECTURER: MR . EDZROL NIZA MOHAMED
SUBJECT:DYNAMICS
TITLE:NEWTON’S LAW/ AIR TRACK
NAME:TENGKU SAKINAH BINTI TENGKU ZAHARI
MATRIC NO:KEP120038
GROUD NO:E
DATE OF EXPERIMENT: 25 APRIL 2013
DATE OF SUBMISSION: 2 MAY 2013

OBJECTIVE
To determine the following uniformity accelerated motion in a straight line. 1. Distance travelled as a function of time
2. Velocity as a function of time
3. Acceleration as a function of the accelerated mass
4. Accelerated as a function of force

THEORY

Newton’s equation of motion for a mass point of mass m to
which a force RF is applied is given by the following:
m · Ra = RF ,
where
Ra =
is the acceleration.
The velocity v obtained by application of a constant force is given as a function of the time t by the expression
Rv
(t) = t
for
Rv
(0) = 0 .
Assuming that
Rv
(0) = 0 ; Rr (0) = 0
the position of Rr of the mass point is
Rr
(t) = · t2 . (0)
In the present case the motion is unidimensional and the force produce by a weight of m1 is
| RF | = m1 · | Rg | ; m1 · g
where g is the acceleration of gravity. If the total mass of the glider is m2 the equation of motion is given by
(m2 + m1) · | Ra | = m1 · g ; (1)
The velocity is
| Rv (t) | ; v= · t (2)
and the position is
| Rr (t) | ; s (t) = · t 2. (3)

APPATUS:

Air track rail 11202.17 1
Blower 13770.93 1
Pressure tube, l = 1.5 m 11205.01 1
Glider f. air track 11202.02 1
Screen with plug, l = 100 mm 11202.03 1
Hook with plug 11202.07 1
Starter system 11202.13 1
Magnet w. plug f. starter system 11202.14 1
Precision pulley 11201.02 1
Stop, adjustable 11202.19 1
Fork with plug 11202.08 1
Endholder for air track rail 11202.15 1
Light barrier, compact 11207.20 4
Timer 4-4 13605.99 1
Slotted weight, 10 g, black 02205.01 8
Slotted weight, 50 g, black 02206.01 4
Weight holder 1 g 02407.00 1
Silk thread, 200 m 02412.00 1
Slotted weight, 1 g, natur.colour 03916.00 20
Portable balance Mod. LS2000 46002.93 1
Barrel base 02006.10 4
Support rod -PASS-, square, l = 400 mm

PROCEDURE:

OBJECTIVE 1

1. The four light barrier is positioned in a manner such the divide the measuring distance into approximately equal segments .Refer figure 1. 2. The starting device is set therefore it would not give an initial impulse when triggered. 3. The last light barrier is placed such that the glider with screen passes through it before the accelerating weight touches the floor. 4. The distance travelled s1…..s4 is measured between the front edge of the screen to the respective light barriers. 5. The ‘slide switch 2’ and ‘slide switch 6’ is set: .”step switch 7” is set to 6. The times t1…t4 is required measured for distance travelled s1….s4 with the timer in the”s(t)”. 7. The graph s-t and s-t2 is plotted.the applied force is calculated from the graph and from the theory.

OBJECTIVE 2
1. The same experiment condition as experiment 1.
2. ‘step switch 7’ is set
3. ‘slide switch 6 ‘is set.
4. ‘slide switch 2’ no functioned in this ‘step switch 7 ‘mode. 5. The shading time ∆t1,∆t2, ∆t3,∆t4 of the four light barriers is measured. 6. The corresponding velocities is determined with the “v(t)” operating mode.v(t)=I/∆tn 7. The velocities correspond to the instantaneous velocities represented by the times t’1,t’2,t’3,t’4 in accordance with the following: t’n=tn +(∆ tn/2) 8. The graph v-t’n is plotted.

9. The acceleration from the graph and from the theory is calculated ten compare the value.

OBJECTIVE3

1. The experiment condition was ensured same as experiment 2. 2. The glider mass is increase by 20g increment(10g each side) and measure the shading time ∆t1,∆t2, ∆t3,∆t4 of four light barriers. 3. The graph v-t’n is plotted for the corresponding glider mass and calculate the acceleration ,a from...
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