Chapter+2,+Section+7

What do you think now: I think that certain sports require certain shoes because of the different requirements of each sport. Football on turf requires different shoes made for traction on rubber compared to football on grass. For turf, large, not necessarily sharp spikes with a large surface area would be best.

Investigation: 1. A. It is a skateboarder's shoe by Etnies, with dark blue coloring. It has no designs and is quite plain. On the bottom of the shoe, there are triangular ridges. It weighs 394 grams.

B. The ridges on the bottom are designed to create friction, which might be a factor on how hard you must pull to move it.

2. A. We will need a shoe and spring scale.

B. We will need to measure the weight of the shoe, which was already done, and then we need to measure how much friction has an effect on how hard you pull.

C. First we will measure the shoe, then pull the shoe on a flat surface and record the amount of force needed. Then we will have the shoe in the air, held by string, and then pull the shoe and see how much energy is required when there is no friction. We would then be able to calculate how much of an effect friction has on the shoe.

D.

Physics to go

1. In baseball, if it starts to rain, they need to cover the dirt in order for the players not to slide when running the bases.

2. In skating or ice hockey, the players or dancers would sharpen their skates to decrease the amount of friction so they may move faster, but stop faster if they wanted to.

3. If the shoes are new and the rubber is high quality on your freshly waxed court, you would have great grip on the court. However, if the other school's court hasn't been waxed in a while, then the court wouldn't have as much friction.

4. On clay, you wouldn't need as much friction on your shoes because the clay would have more friction. For the grass, you would need spikes in order to have a good grip on the grass. For a hard surface you would need something with a lot of rubber and ridges to grip better.

5. 18N. 600x.03

7. I feel that it proportionally the same with the speed. So by that logic, the faster you go, the more of an effect the air resistance will have an affect, proportional to speed.

8. I feel that the stronger your legs, the harder you can push off the ground. The shoes help a bit, but as long as there is a high power/weight ratio of the runner, the runner should be able to run at a very fast speed.

9. We found that my Etnies, if used on a rough surface, have a large force of friction. They would be ideal for use on skateboards and biking. However, due to the weight of the shoe, it would not be recommended for use such as running. If weight was not an issue it might have been a good running shoe with proper ankle support.