Tennis+Players+Have+Fuzzy+Balls

DANNY AND CALEY

Lab goal: to determine which tennis shot, forehand, backhand, or serve produces the highest racket speed.

Question: How do the different strokes affect the speed of the tennis swing? Which stroke produced the most force? How do the different swings affect the acceleration of the racket?

Procedure: 1. Video tape Caley's different tennis swings/shots 2. Upload videos into logger pro 3. Insert scale of Caley's height 4. Analyze the movement of the racket 5. Create a new calculated column to combine the x and y velocities 6. Figure out the slope/line of best fit of the velocity vs time graph. 7. Convert the g to kg, and the ft to m

8. Solve for force with the formula a=f/m using the mass of the racket (.321 kg) 9.Upload everything to wiki Data/Calculations:

media type="youtube" key="Lr51384HYu8?hl=en" height="344" width="425"

a= 157.4 ft/s 1ft=.3048m 157.4ft * .3048 = 47.98 m f = a * m 47.98 m/s * .3281 kg = 15.4 N media type="youtube" key="qqJ0K-9eE3Q?hl=en" height="344" width="425"

a = 104.7 ft/s 1 ft = .3048 m 104.7 ft * .3048 m = 31.9 m f = a * m 31.9 m/s * .321 kg = 10.24 N media type="youtube" key="0lXMLz8zpJU?hl=en" height="344" width="425"

a = 828.1 ft / s 1 ft = .3048 m 828.1 ft * .3048 m = 252.4 m f = a * m 252.4 m/s * .321 kg = 81.0 N

Conclusion/analysis: According to our collected data, the swing the produced the most force was the serve. The swing that produced the least amount of force was the forehand. We feel that these results were accurate because the swing of the serve is on an easier angle because the player tosses the ball to a comfortable position. Although the forehand and the backhand uses similar swings, the backhand produces more force because both arms are used during the swing rather than the forehand. At first we thought the backhand would be the least force because to our eyes, the velocity of the ball seemed much slower than when the ball was hit with the forehand. Some things we could do better next time is the angle of the action shot. Due to the fact that the angle was slightly off, our results are probably not as accurate as we desired them to be.