The red arrows are forces and the blue arrow is the acceleration again. Here is a picture before the skateboard leaves the ground, right when the force on the left wheel is first applied. This induces a counter torque and reduce's the skateboard's upwards momentum. Instead, we push down on it on the left hand side. If we left it alone, it would fly up in the air, flipping, and moving to the right. The skateboard gains a significant amount of momentum upwards in this way. The torque about the right wheel is into your monitor. The blue arrow shows the acceleration of the center of mass. Here is a picture at the first moment, when the skateboard has zero velocity. The upward momentum is provided by a large normal force from the ground. This creates a large torque about the right wheel and makes the skateboard start to rotate up off the ground. We begin by pushing down hard on the right-hand side of the skateboard, to the right of the wheels. The skateboarder never lifts the board - the only necessary upward force in the whole process is the normal force from the ground. The main idea is that the skateboarder pushes down hard on one side out past the wheels, torquing the board up into a hop, then pushes down with the other foot to level the board out and make it appear to stick to the feet. I could make this more accurate by using a slow motion camera to slow down the video so I could see exactly how high I was and get the exact distance during the ollie.A slow-motion video of an ollie makes the physics clear. Some problems I had was getting the exact height and distance of the ollie. I learned that if I had to go a distance, I would need to go faster, but if I needed to go higher, it would not matter how high I go. It does because I said the faster I go, the farther I go and that was true, but does not because I said the faster I go, the higher I go but my height did not change with the speed. My data does and does not support my hypothesis. The data showed that the speed would not affect the height of an ollie but however would affect the distance. Use chalk on the ground to measure where you start and finish the ollie mark chalk on a wall to measure how high the ollie is Find a good spot for the observer to observe the ollies Get a video camera to record the ollies and stopwatch to time Record the speed, height, and distance of the ollie Make sure the materials stay the same throughout the projectĨ How does speed affect the height and distance of an ollie?įor my experiment I Measured how speed would affect how I performed an ollie. That is why I chose this project.Ĥ Hypothesis If I go faster, then I will ollie the highest and the farthest.ī)Dependent-The height and distance of the ollie c)Constants-Same board-trucks-wheels-measurementĦ Set up the area to perform the experiment I wanted to know if this was true or if he was just saying it because of what he thought. I chose this project because I love skateboarding and I wanted to do something different from everyone else.I have background experience because my father always said that if I go faster, then I will go higher and farther. Presentation on theme: "How speed can affect the height and distance of an ollie"- Presentation transcript:ġ How speed can affect the height and distance of an ollieĢ How does speed affect the height and distance of an ollie?
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