• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7
8. 8
8

# Determinating of acceleration due to gravity by timing a simple pendulum

Extracts from this document...

Introduction

Physics Laboratory Report The number and the name of the experiment:Experiment 4- Determinating of acceleration due to gravity by timing a simple pendulum The date of experiment:18 / 1 / 08 Objective * To investigate the relationship between the period and the distance of pendulum bob from the ground * To measure the acceleration due to gravity from the experiment Apparatus * A piece of string at least one meter long * retort stand and clamp * stop-watch * a pendulum bob * g-clamp / heavy stuff(for fixing the stand) * two coins * a table * a chair The diagram of the setup Procedure 1. Attach the pendulum bob to one end of the light string and nail the string to the coins, and place the coins onto the stand. 2. Set the pendulum bob to swing through a small arc of about 200 3. Measure the time for the bob to complete 20 oscillations. 4. Repeat the timing. Record the results in the table. ...read more.

Middle

Table of data distance of the bob from the ground/m Time for 20 oscillations Period of oscillation T / s (Period)2 T2 / s2 t1 t2 t3 t4 Mean t 0.30 50.77 50.86 50.95 / 50.86 2.54 6.47 0.35 50.00 50.01 50.07 / 50.03 2.50 6.26 0.40 49.16 49.16 49.17 / 49.16 2.46 6.04 0.45 48.37 48.28 48.28 / 48.31 2.42 5.83 0.50 47.33 47.38 47.38 / 47.36 2.37 5.61 0.55 46.66 46.55 46.64 / 46.62 2.33 5.43 0.60 45.71 45.71 45.68 / 45.70 2.29 5.22 0.65 44.84 44.83 44.88 / 44.85 2.24 5.03 0.70 43.92 43.92 44.00 / 43.95 2.20 4.83 0.75 42.94 43.00 43.03 / 42.99 2.15 4.62 Theory When the string makes an angle ? with the vertical, the displacement of the bob is the arc length given by x = (H-d)?......(1) and the restoring force acting on it is along the tangent, given by F = -mgsin?......(2). See Fig c, the net force causes the bob to accelerate towards the equilibrium position, given by F = ma = -mgsin?......(3). ...read more.

Conclusion

The sources of errors in the experiment Ans:The pendulum does not oscillate exactly in vertical plane / The reaction time of the observer when he starts timing for beginning and the stopping of the oscillation will cause the human error and lead to the inaccurate reading of time / there exists friction where the string is nailed to the coins and affects the mechanical energy of the pendulum bob system. 3. Suggest improvement to the experiment Ans:Using motion sensor rather than timer to record the oscillation of pendulum bob which is the simple harmonic motion 4. Discuss how the value of H can be determined Ans:By the equation T� = (H-d), we know the value of T�,and d, so we can solve the value of H. Conclusion From the experiment, we obtain that the acceleration due to gravity (g) is 9.69 � 2.24, the period of the oscillations of the pendulum varies inversely as the distance of the pendulum bob from the ground. It is very difficult to carry out the mechanical experiment accurately as many errors must be existed. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Fields & Forces essays

1. ## The Compound Pendulum

5 star(s)

perpendicular to the axis of rotation, which offsets the gravitational force on a body. Also, due to the bulge at the equator; objects are further from the core of the Earth and hence experience a smaller force than at other locations on the Earth.

2. ## Determination of the acceleration due to gravity (g)

4 star(s)

For getting an accurate result, I will do the experiment 3 times to get an average value. These all enable me to get reliable results and plot a nice graph to deduce the acceleration( g ) . I will also use another two methods to get 'g', and compare them

1. ## Experiment to determine gravity from a spring using analogue techniques

and m(BD) are the gradients of the diagonals of the parallelogram and n is the number of points in the graph. A(0.01, 0.10) B(0.10, 0.46) C(0.10, 0.445) D(0.01, 0.08) This uncertainty will be the same for k, because the other component's involved it it's calculation are all constants.

2. ## Investigating the relationship of projectile range and projectile motion using a ski jump.

However, I can change the type of motion of the ball baring. I can use objects that slides rather than rolls down. However, it is hard to make the same object slide and not roll at the same time, whilst minimizing any friction that may occur.

1. ## Investigating the Damping of Motion in a Simple Pendulum through Induced Eddy Currents

Following are typical values for the resistance of the metals I tested, in ascending order: Copper 16.78 n?�m Aluminium 26.53 n?�m Titanium 427 n?�m 1 Austenitic Stainless Steel 690 n?�m Thus one would expect Copper to be effected most by the induced eddy currents, when it was in fact quite the opposite.

2. ## Einstein's theory of relativity.

According to Einstein's theory, Mercury moves along an ellipse, but at the same time the ellipse rotates very slowly in the direction of the planet's motion. The ellipse will turn about forty-three seconds of an arc per century (a complete rotation contains 360 degrees of an arc and 360 X 60 X 60 seconds of an arc).

1. ## Measuring The Constant g; The Acceleration Due To Gravity

zero, since in this experiment objects will be dropped from rest position, as explained later. The 's' will of course, be the displacement. Finally, one can obtain 'g' through the rearrangement of the formula, giving 'g = 2s/t('. Another more complex way to consider obtaining 'g', will be done using

2. ## An Experiment to Evaluate the Acceleration due to Gravity using a Spiral Spring

It can be seen that as the load increases, the g value calculated is closer to that of 9.81ms-². This is possibly due to the fact that as the load increased it became easier to read the oscillations and therefore gain more accurate results.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to