Lasers are often used in Crime Scene Investigation to determine the trajectory (flight path) of bullets - Leaving Cert DCG - Question A-4 - 2013
Question A-4
Lasers are often used in Crime Scene Investigation to determine the trajectory (flight path) of bullets.
In the drawing on the right, two bullet paths are represent... show full transcript
Worked Solution & Example Answer:Lasers are often used in Crime Scene Investigation to determine the trajectory (flight path) of bullets - Leaving Cert DCG - Question A-4 - 2013
Step 1
Determine relationship between lines AB and CD (i)
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To establish whether lines AB and CD intersect, we need to extend projections of both lines.
For line AB, extend it in the direction of both ends to find its elevation projection.
Similarly, extend line CD in its respective direction.
After completing these projections, we can check if they intersect at any point in the elevation view.
Step 2
Determine relationship between lines AB and CD (ii)
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The next step is to extend the projections of lines AB and CD in plan view.
This ensures we can visually confirm their relationship in the horizontal plane.
If they intersect in this plane, we conclude that they are not skew lines.
Step 3
Determine relationship between lines AB and CD (iii)
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After assessing both projections, we can indicate the relationship with a tick.
If the lines intersect in either projection, we check the box for 'Intersecting lines'.
If they do not intersect at any point, we check 'Skew lines'.
Step 4
Determine true length of AC (i)
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To find the length of line AC, we first join points A and C in both plan and elevation views.
This visual representation allows us to measure the line accurately.
Step 5
Determine true length of AC (ii)
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Next, we need to rotate line AC in plan to align it for better measurement.
This step is crucial to ensure we capture any angles that could affect the perceived length.
Step 6
Determine true length of AC (iii)
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Finally, we perform a construction in the elevation view to determine the exact true length of line AC.
By manipulating the line based on the elevations and the angle created, we can accurately measure the length using appropriate geometric methods.
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