• 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

# The aim of the experiment using the 3 point reaction board, is to be able to work out the where the centre of gravity is on a subject during a physical activity.

Extracts from this document...

Introduction

3 POINT REACTION BOARD

Introduction:

The aim of the experiment using the 3 point reaction board, is to be able to work out the where the centre of gravity is on a subject during a physical activity. The 3 point reaction board is quite accurate as it works out the position of the centre of gravity from two dimensions. This type of analysis as Hay describes ‘has been become of significant use in many years, due to being able to find the centre of gravity during an activity and enhancing the ability to analyse sporting techniques’(1993). There has been many different methods used to try and find the centre of gravity although the 3 point reaction bard has proved to be one of the best. It is accurate, but can still only give an estimate as the centre of gravity changes for every breath or slight movement made, although it does allow an indication.

There is a method called the reaction board, which is the simplest.

Middle

1 33.5,         R 2          74         62

CB        =        Y        Scales         A        R 1 22,5,        R  2        41        53

## χ        =        ( 74        -        33.5 )        2.01        =        1.02m

80

γ        =        ( 41        -        22.5 )        2.01        =        0.46m

80

Conclusion

This is where the centre of gravity is on majority of people, but when the position of the body changes so does the centre of gravity. Being able to find the centre of gravity during many different positions can be very useful. When a subject carries out a long jump the centre of gravity changes depending on the position of the body.

Fig. 1

If the subject were to transform the position of the body in the air the subject would be able to continue to travel further in the air. This due to the findings of the experiment that being able to transform into a sitting position in the air the centre of gravity moves to the front of the body or even out side of the body to cause forward momentum.

Fig. 2

Reference List:

• Hay, J (1993) The Biomechanics of Sports Techniques. Prentice-Hall Inc. New Jersey.
• Hochmuth, G. (1984) Biomechanics of Athletics Movement. Sportverlag, Berlin.

This student written piece of work is one of many that can be found in our AS and A Level Mechanics & Radioactivity 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 Mechanics & Radioactivity essays

1. ## Investigating a ski jump

45 92 368 16560 128.7 50 92 368 18400 135.6 Apparatus Apparatus Use Curtain Rail This will be used as a ramp for the ball to roll down Ball Bearing Object that models skier as a particle Meter Ruler Will be used to measure the range (x)

2. ## Investigating the factors affecting tensile strength of human hair.

The (E) part of the formula relates the size of the difference to the magnitude of the numbers involved. The sigma (?) 'sum' symbol is required because there is not just one pair of observed and expected values, but several (in this case four).

1. ## Objectives: To determine the center of gravity of a body of irregular shapes

Then the inaccurate lines and intercept point are drawn on the paper. As a result, an incorrect center of gravity of the irregularly shaped board is found. To avoid such error, we should close all the windows and turn off the all fans and air conditioners to minimize the effect of movement of air on the boards.

2. ## Biomechanics of Long Jump

In 1995 Ivan Pedrosa beat Mike Powell's record in the high altitude of Italy which proves that there is an assistance of altitude which creates less gravity and wind resistance. The penultimate stride right before take off the jumper's centre of gravity is lowered, the body id tilted backwards and

1. ## Investigatin a ski jump

H (cm) 4H (cm) R� (h x 4H) R (VR�) 5 92 368 1840 42.9 10 92 368 3680 60.7 15 92 368 5520 74.3 20 92 368 7360 85.8 25 92 368 9200 95.9 30 92 368 11040 105.1 35 92 368 12880 113.5 40 92 368 14720 121.3

1. ## In this report I will start by exploring the history of the Computerised Tomography ...

head are distinguished by the detectors on the other side of a gantry. In conventional radiography we utilise a film screen to detect the data; in CT the image receptors are the detectors. According to Roberts P.D (1990), the detectors must exhibit several characteristics such as the ability to capture, absorb and convert X-rays into electrical signals.

2. ## How aerial travel and Cabin Pressure adversely affects the Human Body

Due to the effects of hypoxia, alcohol consumption would affect the brain much more than it would on Earth. As the aircraft makes its decent back to Earth, air must be allowed to flow into the middle of the ear to equalize pressure differences.

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