ATA ATA Bow Tech Bow Mechanics & Physics

Question 1

What is 'let-off' in a compound bow?

Accepted Answer

The percentage reduction in holding weight at full draw due to the cam system

Answer

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?

Accepted Answer

The distance from the string to the deepest part of the grip at rest

Answer

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?

Accepted Answer

It increases arrow speed but reduces forgiveness

Answer

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?

Accepted Answer

To mechanically store energy during the draw and release it efficiently to the arrow

Answer

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?

Accepted Answer

Arrow speed in fps under standardized conditions: 70 lb draw, 30-inch draw length, 350-grain arrow

Answer

IBO (International Bowhunting Organization) speed is a standardized benchmark allowing shooters to compare bows under identical conditions.

(ATA) Archery Trade Association Bow Technician Certification Practice Test