ATA ATA Bow Tech Bow Mechanics & Physics 1 — Questions and Answers
Question 1: What is 'let-off' in a compound bow?
- The percentage reduction in holding weight at full draw due to the cam system (Correct answer)
- The weight of the bow at brace
- The speed of the arrow at release
- The distance the string travels during draw
Correct answer: The percentage reduction in holding weight at full draw due to the cam system
Let-off is the reduction in draw weight a shooter holds at full draw, expressed as a percentage, provided by the cams.
Question 2: What is the brace height of a bow?
- The distance from the string to the deepest part of the grip at rest (Correct answer)
- The height of the bow riser from the ground
- The length of the arrow shelf
- The distance between the top and bottom cam
Correct answer: The distance from the string to the deepest part of the grip at rest
Brace height is measured from the pivot point of the grip to the bowstring when the bow is at rest.
Question 3: How does a shorter brace height generally affect bow performance compared to a longer brace height?
- It increases arrow speed but reduces forgiveness (Correct answer)
- It reduces arrow speed and increases forgiveness
- It has no effect on speed or forgiveness
- It increases both speed and forgiveness equally
Correct answer: It increases arrow speed but reduces forgiveness
A shorter brace height means the string is in contact with the arrow longer, generating more speed but reducing the margin for shooter error.
Question 4: What is the function of a bow's cam system?
- To mechanically store energy during the draw and release it efficiently to the arrow (Correct answer)
- To stabilize the bow during transport
- To adjust the arrow rest position
- To connect the limbs to the riser
Correct answer: To mechanically store energy during the draw and release it efficiently to the arrow
The cam system converts the shooter's draw force into stored potential energy and releases it as kinetic energy to propel the arrow.
Question 5: What does IBO speed rating measure in a compound bow?
- Arrow speed in fps under standardized conditions: 70 lb draw, 30-inch draw length, 350-grain arrow (Correct answer)
- Maximum draw weight of the bow
- The bow's vibration level after the shot
- The bow's accuracy at 30 yards
Correct answer: Arrow speed in fps under standardized conditions: 70 lb draw, 30-inch draw length, 350-grain arrow
IBO (International Bowhunting Organization) speed is a standardized benchmark allowing shooters to compare bows under identical conditions.
Question 6: Which component is primarily responsible for transferring energy from the limbs to the bowstring in a compound bow?
- The cables and cams (Correct answer)
- The arrow rest
- The stabilizer
- The peep sight
Correct answer: The cables and cams
Cables connect the cams to the limbs and string, acting as the mechanical link that transmits stored limb energy to the string.
ATA ATA Bow Tech Bow Mechanics & Physics 1
What is 'let-off' in a compound bow?