## Summer Fun

This summer I went bike riding quite often, I went bilking with my mom and my sister. We usually biked around the neighborhood, we went out at about five or six o'clock, and usually went biking towards the end of the summer. We used our bikes for the activity that we love doing together, We decided to go riding because it was probably nice day and we wanted to spent some time together. One time when we were biking we took a different route, and when we took the route we went through the country side, we saw that one of the cow pens were open and realized that one of the cows had escaped from the the pen!

## Two Connections To Science

Biking is connected to science, one way that it is, is that when you bike you create friction, if your going downhill fast on your bike and suddenly put on the brakes, the brakes are running against the wheels, creating fraction, and the wheels rubbing against the pavement when going Down the hill fast creates friction. When you press the brake levers on the bike, a pair of rubber shoes clamp on the metal inner surface of the front and back wheels. When the brake shoes rub tightly against the wheels, they turn our kinetic energy into heat which has the effect of slowing you down, therefore creating friction. My second connection I have that biking is scientific is that when your biking you have to overcome wind resistance, to overcome wind resistance you have to have aerodynamics. Aerodynamics connect to science because even though humans aren't aerodynamic they are trying to make bikes more aerodynamic. Aerodynamic drag consists of two forces: air pressure drag and direct friction. A big, heavy object disturbs the air flowing around it, forcing the air to separate from the surface. Low pressure regions from behind result in a pressure drag against the object. With high pressure in the front, and low pressure behind, the biker has a harder time biking at faster speeds.

Sources: "The Science of Bicycles." Bicycle Science. N.p., n.d. Web. 04 Sept. 2015.

"Science of Cycling: Aerodynamics & Wind Resistance | Exploratorium." Exploratorium: The Museum of Science, Art and Human Perception. N.p., n.d. Web. 04 Sept. 2015.

## Four Questions I Have

1. What is the fastest speed someone has ever gone on a aerodynamic bike?

2. What is the fastest someone has ever gone on a non-aerodynamic bike?

3. How long does it take for the average person to balance on a bike?

4. What's the average age when kids don't need training wheels?