• 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

# Gravity and Acceleration

Extracts from this document...

Introduction

PHYSICS LAB REPORT

Gravity and Acceleration

Aim: To show that the acceleration of a freely falling body is equal to the gravitational pull of the Earth. To give a comparison of the various values obtained using different methods and show how external factors play a role in the measurement of the acceleration of a body.

Hypothesis: If a body is dropped from a height then its acceleration will be equal to the gravitational pull of the earth because a freely falling body is attracted towards the earth due to its gravity independent of the mass of the object and neglecting air resistance.

Abstract: In this experiment the following principles will be investigated.

• If an object held near the surface of the earth is released, it will fall and accelerate, or pick up speed, as it descends. This acceleration is caused by gravity, the force of attraction between the object and the earth.
• Falling objects accelerate in response to the force exerted on them by Earth’s gravity. Different objects accelerate at the same rate, regardless of their mass.

Middle

Given below is the table of the readings taken using the photogate for acceleration of the picket fence. The graph obtained using the photogate shows a reading of 9.985m/s.

Logger Pro Column Data:

Time        GateState        Distance         Velocity            Acceleration

s                                     m                    m/s                m/s²

0.0212828        1        0

0.0431212        0

0.0628832        1        0.05                1.4057                 9.799

0.0790828        0

0.0948828        1        0.1                1.7219                   9.96

0.1083        0

0.121821        1        0.15                1.987              9.78

0.13352        0

0.145584        1        0.2                2.2248           10.16

0.156083        0

0.167009        1        0.25                2.439                     9.83

0.176583        0

0.186725        1        0.3

0.195618        0

Observation:

While using the logger pro software the picket fence was released half way after the time limit.

The laser of the photogate must be cut by the picket fence before it is released.

Ticker Tape:

The

Conclusion

Where M is the mass of the trolley, m is the mass of the weight,   a is the acceleration and g is the gravitational pull.

= (0.96 – 0.1) 0.375/0.1 = 3.225m/s2

Error %= 9.8-3.225/9.8 * 100 = 67.09%

According to this value of acceleration the value of g should be 3.225m/s2 which proves that there are errors in the experiment.

The reason for this is that the weight is not allowed to freely fall and this causes a variation in the acceleration.

Conclusion:

From the above experiments we can see that acceleration of a freely falling body would be equal to gravity if it wasn’t for the external factors the variables. One of the main factors is air resistance.

Also the value for the photogate is much more accurate as air resistance is low and there is no friction involved.

Evaluation:

• Weight used in the ticker tape experiment must not be too heavy.
• If the ticker tape were to be removed then the results could be more accurate.
• The length to be covered by the trolley before it stops must be increased.
• The whole pulley system could be eliminated and only the weight and the ticker tape could be used. The weight can be released and the ticker tape fixed to it. This will give us the acceleration during freefall.

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. ## Experiment to determine gravity from a spring using digital techniques

3 star(s)

* This process was repeated with other masses, in 50g increments, with the total mass on the spring being weighed each time. * From this, a graph of mass against extension can be plotted, and a value for gravitational field strength calculated. Results Part 1 Mass (kg)

2. ## Investigating the forces acting on a trolley on a ramp

5 star(s)

cos O), � cos O is equal to the frictional force Fr, hence, if we want to discount Fr, we remove this from the equation. This gives the formula; g = a / sin O However, to take a more accurate result, it is necessary to incorporate friction into the results and take steps to eliminate it.

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

4 star(s)

to find out which method is the best to use to get the most reliable results. The other two methods are: Using a ticker-timer When weight is falling down, it pulls a tape through a ticker-timer. The spacing dots on the tape increases steadily and showing that the weight is accelerating.

2. ## Objective To find the acceleration due to gravity by means of a simple ...

It causes the error in calculating the slope and so the acceleration of the motion. Absolute error of length = 0.2mm Absolute error of time = 0.01s Experiment value of g = 9.52 ms-2 g = ==> = 2 Find the for each experiment by using the above formula: Effective

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

0.04 1 4.6 4.70 2 4.6 3 4.8 4 4.8 0.05 1 5.0 5.05 2 5.2 3 5.0 4 5.0 0.06 1 5.5 5.45 2 5.4 3 5.4 4 5.5 0.07 1 5.8 5.80

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

For small angle?, we have sin?? ......(5). Putting (5) into (3), we have ma?-X, or a = -X......(6) for small amplitude. Hence the motion is simple harmonic and the period is T = 2?V. By taking square on the both side, T� = (H-d)......T� = -d + H, Where -is the slope and H is the y-intercept.

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 clearly seen that there is a degree of uncertainty to the accuracy of the results.

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