# The Science of Golf. Test Lab Toolkit The Swing: Putting. Grades Education

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1 The Science of Golf Test Lab Toolkit The Swing: Grades 9-12 Partners in Education Science Technology Engineering Mathematics

2 Table of Contents Welcome to the Test Lab 02 Investigate: Gravity on the Green 03 Investigate: Speed and Friction 06 Create: Green 10 Connect: Your Local Golf Course 13 Key Concepts 16 Test Lab Toolkits bring math and science to life by showing how STEM studies play a big role in the game of golf. They are funded by Chevron and the USGA, partners in STEM education.

4 Investigate: Gravity on the Green Grades 9-12 S T E M Is a straight line always the best path to the hole? greens may appear flat, but most have undulations that prevent a ball from rolling straight. Gravity always pulls the ball downward, so the putter must make the ball curve, or break, toward the hole. In this activity, you will explore how clubface angle, aim, and swing speed make the ball move. What Do You Need? Large plastic cup Masking tape Putter (or stick of similar length) Putter Head Closed face angle Putter Head Open face angle Golf ball (or similar small ball) Rope or string Protractor Putter path direction 10 5 Ball path Ball-hole line Putter Head Square face angle Ball Putter Deviation Angle Ball Deviation Angle Hole The Science of Golf 03

5 Investigate: Gravity on the Green Grades 9-12 What Do You Do? What Happens? 1 Locate a level surface at least 10 feet in diameter. In the middle, set up a target by lying the cup on its side and taping it to the floor. Around the outside of the space, mark units like a clock-face. 2 Stand 5 feet away from the cup, at the noon position. Imagine a straight line from your ball to the cup (the ball-hole line). 3 Putt the ball directly along the ball-hole line, with the clubface perpendicular to your body and medium speed. 4 Mark the spots where the putter and ball stop with tape. Use 2 pieces of long string and a protractor to determine the angle of deviation of the putter s path (based on its end position) from the ball-hole line, and the angle of deviation of the ball s end point from the ball-hole line (if it missed the cup). Record your results. 5 Repeat with different combinations of swing speed (slow, medium, fast), aim (straight, to the left, to the right), clubface angle (square, open, closed), and position (3 o clock, 6 o clock, etc.). 6 For each variation, predict what will happen and then record what did happen. Challenge! Do this experiment on a sloped surface, and try standing at the top, at the bottom, or to the side of the slope. How do you need to adjust your clubface angle, aim, and swing speed to compensate for the slope? Use the chart to record your data and make more charts as needed. Diagram your data, using the illustration as a model. For each variation, show the ball-hole line, the initial and end points of the putter and ball, and their paths and angles of deviation. What Does it Mean? What did you learn about the speed and the path of the ball? Which combination of clubface angle, aim, and speed is most successful at hitting the ball into the cup? Find Out More Read Key Concepts. Watch the NBC Learn video Kinematics at www. nbclearn.com/science-of-golf. 04

6 Investigate: Gravity on the Green Grades 9-12 Position Where are you standing? Clubface Angle Square, open, or closed? Swing Aim Straight, left, or right? Swing Speed Fast, medium, or slow? Putter Path Angle of Deviation Ball Angle of Deviation 12 o'clock square straight medium 10 5 Add this chart to your Test Lab Log! 05

7 Investigate: Speed and Friction Grades 9-12 S T E M Why does your putt roll fast or slow? On a putting green, it isn t just how hard you swing that matters. It s also the speed of the green how far and fast the ball rolls before friction slows it down. The USGA Test Center uses a Stimpmeter to measure green speeds. In this activity, you ll build your own Stimpmeter and try it out. What Do You Need? 2 narrow pieces of firm material at least 36 inches long, such yardsticks or cardboard Tape or glue Scissors or marker Protractor Tape measure Golf ball, plus at least two other types of small balls (ping pong ball, hard rubber ball, etc.) At least three different surfaces to test on (grass, astroturf, carpeting, cement, wood, etc.) Stopwatch 36" 29.4" 21 Notch Stimpmeter The Science of Golf This activity is adapted from NBC Learn, Science of Golf: Kinematics ( 06

8 Investigate: Speed and Friction Grades 9-12 What Do You Do? 1 Build a Stimpmeter. Hold two pieces of firm material together length-wise, so they form a v-shaped channel. Tape or glue them. Cut a notch (or mark a spot) at 29.4 inches from the end. 2 Stand on a level surface, at least 15 feet long. Face the center. 3 Using the protractor, raise the notched end of the Stimpmeter to 21 degrees. Release the ball from the notch. Record how far and long it rolls from the END of the Stimpmeter until it stops. 4 For each experiment, follow these steps: Roll the ball 3 times in one direction. Average the results. Walk to where the ball stopped rolling and turn around to face your starting position. First Direction Rolls 1,2,3 10' Now roll the ball 3 times in the opposite direction. Average the results. Calculate the combined average. 5 Test how a ball rolls across at least 3 different surfaces. Calculate time and distance averages for each surface, and average rates of deceleration (assuming the standard speed from the end of the Stimpmeter is 6.4 feet/sec). 6 Test how at least 3 different balls roll across the same surface. Calculate time and distance averages for each ball, and average rates of deceleration. 7 Roll a ball across the same surface with the Stimpmeter at 3 different angles. Calculate time and distance averages for each angle, rates of acceleration along the Stimpmeter, speeds at the end of it, and rates of deceleration. Opposite Direction Rolls 4,5,6 Formulas Velocity = distance/time Acceleration rate = (final velocity at end of Stimpmeter starting velocity at release point) / time to travel to end of Stimpmeter Deceleration rate = (final velocity at rest starting velocity at end of Stimpmeter) / time to travel from Stimpmeter to complete stop What Happens? Use the chart to record your data and make more charts as needed. For the surface and ball experiments, graph deceleration rates. For the angle experiment, make a speed-versustime graph that shows the changing speed of the ball from (A) point of release to (B) top speed at the end of the Stimpmeter to (C) state of rest. What Does it Mean? Which experiment had the fastest green? The slowest? What did you learn about friction and speed? 07

9 Investigate: Speed and Friction Grades 9-12 Challenge! Calculate the speed of a single ball across a single surface with a small slope. Follow the standard steps, rolling the ball first uphill and then downhill. If S is the average distance of the uphill rolls and S is the average distance of the downhill rolls, use this formula to find the speed of the sloped green: 2 x S x S S + S Find Out More Read Key Concepts. Watch the NBC Learn video Kinematics at 08

10 Investigate: Speed and Friction Grades 9-12 Chart 1 Surface Distance: Starting Direction feet Distance: Opposite Direction feet Roll 1 Roll 2 Roll 3 Average Roll 4 Roll 5 Roll 6 Average Grass Overall Distance Average Speed of the Green feet Chart 2 Surface Time to Travel to End of Stimpmeter seconds Roll 1 Roll 2 Roll 3 Roll 4 Roll 5 Roll 6 Average Time seconds Velocity at End of Stimpmeter feet/second Acceleration Rate feet/second 2 Chart 3 Surface Time to Travel to End of Stimpmeter To Complete Stop seconds Roll 1 Roll 2 Roll 3 Roll 4 Roll 5 Roll 6 Average Time seconds Velocity at End of Stimpmeter feet/second Deceleration Rate feet/second 2 Add these charts to your Test Lab Log! 09

11 Create: Green Grades 9-12 S T E M What makes a putting green challenging, but not impossible? The USGA Test Center helps golf courses make sure that putting greens challenge the skill level of the players, but aren t unfair. In this activity, you ll use what you ve learned about friction, speed, and angles to create your own putting green and then compete with your friends in a tournament! What Do You Need? Paper Pens Materials for the green surface (astroturf, cardboard, fabric, etc.) Materials to create hazards (water, sand, etc.) Scissors Large plastic cup (one per hole) Masking tape Putter (or stick of similar length) Golf ball (or similar small ball) Flag/Hole Fringe The Science of Golf 10

12 Create: Green Grades 9-12 What Do You Do? What Happens? 1 Find a large space where you can create one or more putting greens. 2 Design them first on paper, including shape, hole size and placement, and standard golf course hazards (sand pit, water, etc.). Think about what would make a green harder or easier faster isn t necessarily better. 3 Build the putting green(s) out of available materials, taping down one cup per hole for the target. 4 Have everyone play each putting green once. Record the scores. For each hole, calculate the average of the top half of the scores (the better half average). You can use this average as par. 5 Have a tournament. Invite friends to play also! Record your scores. Note the results, including diagrams and/or photos of the putting greens. What Does it Mean? How did what you know about friction, speed, and angles influence your design? What is the best strategy for playing each hole, and why? Find Out More Read Key Concepts. Watch the NBC Learn video Kinematics at 11

13 Create: Green Grades 9-12 HOLE PAR [NAME] Add this chart to your Test Lab Log! 12

14 Connect: Your Local Golf Course Grades 9-12 S T E M How fast is your local golf course? The putting green speed of American golf courses ranges from 7 to 12 feet. How does your own local golf course compare? In this activity, you ll use a Stimpmeter to find out! What Do You Need? 2 narrow pieces of firm material at least 36 inches long, such yardsticks or cardboard Tape or glue Scissors or marker Protractor Tape measure Putter Golf ball Par yards Water Hazard Rough Tee Box Fairway Bunker Green Hole Fringe Out of Bounds The Science of Golf 13

16 Connect: Your Local Golf Course Grades 9-12 Hole Distance: Starting Direction feet Distance: Opposite Direction feet Roll 1 Roll 2 Roll 3 Average Roll 4 Roll 5 Roll 6 Average feet Overall Distance Average Speed of the Green Add this chart to your Test Lab Log! 15

17 Key Concepts Acceleration The increase of an object s velocity over time. A = (V2 V1) / (T1 - T2) Breaking on the Green The way a golf ball curves (or breaks) toward the hole, due to the slope of the green and gravity. Deceleration (Negative Acceleration) The decrease of an object s velocity over time. D = (V2 V1) / (T1 - T2) Friction A force between objects moving in different directions, when their surfaces touch each other and oppose each other s motion. Gravity A force of attraction that pulls objects toward each other. The more mass an object has, the stronger its gravitational pull. Kinematics A branch of classical mechanics in the science of physics that describes motion through position, velocity, and acceleration. Position The place where an object is located. Read the Green To look carefully at the shape, slope, grass, etc., of a putting green to figure out the best way to putt a golf ball into the hole. Speed The measure of how fast an object travels a specific distance over a specific time. S = D / T Speed of the Green How fast or slow the ball moves across a putting green. Stimpmeter A simple device that rolls a golf ball onto a putting green at a fixed speed, so that you can measure how fast or slow the green is. Velocity The measure of speed in a specific direction. 16

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