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The Physics of Golf


Quiz Questions

1.Figure 1 is :
The artist drawing of a golf swing
Double pendulum model of the golf swing
2. In figure 1d shows the swing at impact. In general we want the club position at
Vertical
Slightly angled
Horizontal
3.The angular position of the upper link at the point where the club swings out, θ in figure 1(b), is referred to as the release angle. An expert golfer normally swings the club in such a manner that the wrist-cock angle stays fixed beyond the natural release point.
True
False
4. Figure 2 shows an example where the values for the hub couple, release angle and wrist-cock angle, are the same as were used for figure 1, but the backswing angle is greatly reduced.
True
False
5.In this case the hands will be ahead of the clubhead at impact and the ball would be missed or at best miss-hit.
True
False
6.In the case of an increased backswing angle, with the other parameters fixed, the model shows that the clubhead will lead the hands at impact. Timing is, therefore, crucial in the model, as it is with a real golf swing, and changing one parameter in the model will normally require another parameter to be changed if the clubhead is to make solid contact with the golf ball.
True
False
7. The clubhead speed at impact is the primary factor in determining the length of a drive and, as a rough approximation, each percentage gain in clubhead speed will result in a corresponding percentage increase in drive distance. In varying the parameters in the swing model there is, however, the constraint that the golf club needs to be approximately vertical at impact if solid contact with the golf ball is to be made.
True
False
8. Skilled golfers are found to transfer their weight at a fast rate and reach a peak, in terms of the weight resting on the front foot, near mid-downswing. Lessskilled golfers are found to transfer their weight at a much slower rate with peak weight transfer coming later in the downswing. In addition, the actual weight transfer for both the backswing and the downswing is found to be much less for the less skilled player.
True
False
9.These results would seem to indicate that the more skilled players generate more power through the use of the large muscles of the legs and hips while the high-handicap player relies more on the swinging of his or her arms. In terms of the swing model, these results also imply that a skilled golfer is applying a greater lateral shift of the hub than are the unskilled players.
True
False
10.The first topic considered in the physics of golf ball will be the measurements and models of the normal and tangential forces exerted on the various golf ball constructions during impact with the clubhead or with fixed barriers. The normal force will determine:
The launch speed of the golf
The amount of spin
11. The tangential force will determine
The launch speed of the golf
The amount of spin
12. One of the most interesting phenomena in the game of golf is the distance the ball can be driven. The large distances are due to:
The effect that the dimples on the cover
The spin of the golf ball have on the aerodynamics.
All the above
13. A golfer will typically want a golf ball with a
High coefficient of restitution
Low coefficient of restitution
14.A standard two-piece ball will typically have a solid rubber core with a hard ionomer blend cover while a standard three-piece ball will have either a solid rubber or liquid filled core wrapped in a layer or rubber windage and will normally be covered with a softer synthetic balata. The standard two-piece ball has traditionally been known for its durability and its performance in distance while professionals have normally preferred the standard three-piece ball for its ability to ‘hold the green’ with its higher spin rates. Nowadays, all combinations of cores and covers can be found on the market as well as multilayer golf balls, which consist of three or more solid layers of various materials.
True
False