Backward bounce of a spinning ball

Cross, Rod

doi:10.1088/1361-6404/aabece

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…If that analogy is valid, then the normal reaction force on a ball incident on a surface with backspin would be expected to be larger at the rear of the ball than at the front. Some evidence of the latter effect was observed previously when bouncing a billiard ball with backspin on a rigid surface [17], but the effect was very small since the contact area of the ball was very small. The advantage of using a rubber ball is that the contact area is relatively large at moderately high impact speeds, and it simulates effects likely to be observed with other soft balls such as a soccer, tennis, golf or basketballs, or with soft granular materials.…”

Section: Introductionsupporting

confidence: 58%

Oblique impact of a spinning rubber ball

Cross¹

2019

Eur. J. Phys.

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Measurements are presented on the oblique impact of a hollow rubber ball incident with spin on a polished granite surface. When incident with substantial backspin there is a large decrease in the horizontal ball speed and a large change in the spin of the ball. When incident with substantial topspin, there is only a small decrease in the horizontal speed and only a small change in ball spin. The impulse due to the friction force is therefore a strong function of the incident spin. The measured impulse determines if and when a transition from a sliding to a grip phase occurs. The line of action of the normal reaction force acts behind the centre of mass when the ball is incident with backspin, and ahead of the centre of mass when the ball is incident without spin or with topspin.

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Section: Introductionsupporting

confidence: 58%

Oblique impact of a spinning rubber ball

Cross¹

2019

Eur. J. Phys.

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“…However, one possible effect of an asymmetric deformation or an asymmetric force distribution acting on the ball is that the line of action of N (normal to the horizontal surface) may be offset by a horizontal distance D from the centre of the ball. The model has been described previously [7], so only the relevant results are summarised here, all symbols being defined in figure 2.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Values of ω 2 are normalised to an incident speed of 4 m s −1 to minimise scatter in the data due to small variations in the incident speed. At any given angle of incidence, equations ( 6) and (7) indicate that ω 2 is directly proportional to the incident speed when ω 1 = 0.…”

Section: Golf Ball Incident On Granitementioning

confidence: 99%

Oblique impact of a hard ball on a soft surface

Cross¹

2021

Eur. J. Phys.

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The impact of a hard ball on a soft surface involves deformation of the surface, with consequent changes in the coefficient of restitution (COR) as the angle of incidence is varied. Experimental results are presented for oblique impacts of a golf ball with grass and carpet surfaces, and the impact of a billiard ball with clay and foam surfaces. It was found that the COR depends on two main factors. One is the usual variation of the COR with impact speed in a direction normal to the surface. The other involves deflection of the ball arising from indentation of the surface. The indentation forms a ramp that acts to project the ball at a steeper angle.

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