Physics of Golf: Angular Momentum & External Torque

  • Thread starter Thread starter sauri
  • Start date Start date
  • Tags Tags
    Golf Physics
AI Thread Summary
The discussion centers on the angular momentum of a golf ball putted past a hole, moving at constant velocity and ignoring friction. It is established that the angular momentum about the hole remains constant, although its direction changes due to external torque. The participants emphasize the importance of understanding the relationship between angular momentum and the forces acting on the ball, noting that all forces must sum to zero for constant velocity. The definition of angular momentum is highlighted, specifically the equation L = r x p, where r is the position vector and p is the momentum. Overall, the conversation delves into the physics principles governing the motion of the golf ball in relation to angular momentum and torque.
sauri
Messages
51
Reaction score
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?
 
Physics news on Phys.org
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.
 
sauri said:
What is the angular momentum of the golf ball about the hole?
Consider the definition of the angular momentum of a particle:
\vec{L} = \vec{r} \times \vec{p}
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Angular Momentum- Conserved or not?
Replies
17
Views
415
Confused on whether this counts as an external torque
Replies
4
Views
1K
Change in Angular Velocity While Orbiting With No Torque
Replies
30
Views
3K
Angular Momentum of a Moving Particle
Replies
2
Views
2K
Angular momentum conservation on a merry-go-round
Replies
5
Views
2K
Simple Ice Skater with Conservation of Angular Momentum
Replies
4
Views
2K
Why can I neglect angular momentum due to precession here?
Replies
8
Views
267
Horizontal impulse on a ball at rest on a plane (with friction)
Replies
14
Views
3K
Speed of cylinder rolling along a horizontal surface gathering snow (Solved)
Replies
13
Views
2K
Angular and Linear Momentum Problem
Replies
18
Views
3K

Hot Threads

Recent Insights

Back
Top