The drawing shows the projections of a set of soccer goal posts - Leaving Cert DCG - Question A-1 - 2014
Question A-1
The drawing shows the projections of a set of soccer goal posts. A ball is positioned at P for two penalty kicks during a World Cup match. The ball travels in a stra... show full transcript
Worked Solution & Example Answer:The drawing shows the projections of a set of soccer goal posts - Leaving Cert DCG - Question A-1 - 2014
Step 1
Extend line PS in plan
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Answer
Extend the line PS horizontally in the plan view to outline the path of the ball as it approaches the goal.
Step 2
Locate entry point at correct height in end view (or auxiliary view)
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Answer
In the end view, mark the entry point of the ball at the halfway height, which is determined by measuring the height of the goal and dividing it by two.
Step 3
Location of impact point on net in elevation (or auxiliary view)
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Answer
Draw a vertical line from the entry point to indicate where the ball strikes the net in the elevation view.
Step 4
Complete projections of path in plan and elevation
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Answer
Finally, connect the points in both plan and elevation views to form a continuous trajectory, showing the complete flight path of the ball until it hits the net.
Step 5
Extend line PT in plan
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Answer
Extend the line PT from point P at a 15° angle to represent the flight path of the ball for the 2nd penalty kick in plan view.
Step 6
Correct use of 15° angle in auxiliary view (or rotated view)
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In the auxiliary view, draw a line at a 15° angle from the horizontal that shows the correct slope of the ball’s flight path.
Step 7
Location of impact point on net in elevation
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Mark the impact point at the appropriate height in the elevation view, ensuring that it corresponds with the trajectory shown in the plan view.
Step 8
Complete projections of line
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Answer
Draw the projections in both the plan and elevation views to finalize the complete flight path of the ball for the second penalty kick.
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