Physics of Golf: Angular Momentum & External Torque

L} = \vec{r} \times m\vec{v} In summary, the conversation discusses the angular momentum of a golf ball that is putted too fast and rolls past the hole at a distance d. The question is whether the angular momentum is constant about this point, to which it is believed that it is constant but its direction changes due to an external torque. The conversation also mentions using the equation d(theta)=dL/L and drawing components to find the sum of forces in the X and Y directions. The final question is about the specific value of the golf ball's angular momentum about the hole, which can be calculated using the definition of angular momentum for a particle.
  • #1
sauri
51
0
A golf ball is putted too fast and rolls past the hole in a straight line, coming at closest approach to a distance d from the hole. Ignore friction and assume that golf ball moves at constant velocity.
What is the angular momentum of the golf ball about the hole?
Is the angular momentum constant about this point?

I believe that the angular momentum is constant but its direction changes due to an external torque. Yet the equation to use is beyond me could it be d(theta)=dL/L?
 
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  • #2
Actually... When we say a golf ball has a constant velocity, all the forces must add up to be zero.

Start with that by drawing components then doing a sum in the X and Y directions.
 
  • #3
sauri said:
What is the angular momentum of the golf ball about the hole?
Consider the definition of the angular momentum of a particle:
[tex]\vec{L} = \vec{r} \times \vec{p}[/tex]
 

1. What is angular momentum and how does it relate to golf?

Angular momentum is a measure of an object's rotational motion. In golf, it refers to the amount of spin placed on a golf ball by the club. The greater the angular momentum, the more spin the ball will have, resulting in longer shots and better control.

2. How does external torque affect a golf swing?

External torque is the force that causes an object to rotate. In golf, this force is generated by the golfer's body and the club. The proper use of external torque can lead to a more powerful swing and better control of the ball.

3. How does the angle of the clubhead affect a golf shot?

The angle of the clubhead at impact determines the direction and trajectory of the golf ball. A steeper angle will result in a higher shot, while a shallower angle will result in a lower shot. The angle of the clubhead also affects the amount of spin on the ball.

4. What is the role of center of mass in golf?

The center of mass is the point at which an object's mass is evenly distributed. In golf, the golfer's center of mass plays a crucial role in maintaining balance and stability during the swing. It also affects the golfer's ability to generate power and control the club.

5. How does the physics of golf impact club fitting?

The physics of golf, specifically angular momentum and external torque, play a significant role in club fitting. The proper fitting of clubs, including length, weight, and loft, can optimize a golfer's swing and improve their performance on the course.

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