Biology Botany Physics 

How Do Plants Know Which Way to Grow?

By Shayna Keyles (@shaynakeyles) How do plants know which way is up and which way is down? No matter which way you put a seed in the soil, it will always send its roots down and its shoots up. (Unless you’re in space–we’ll get back to that later.) The answer lies in tropism: motion in response to external stimulus. This is pretty amazing, considering that in the traditional sense, plants can’t move. Specifically, plants are affected by geotropism, phototropism, and hydrotropism. In other words, plants move toward gravity, light, and water,…

Read More
Science of Skateboarding, Halfpipe Physics Physics 

Science of Skateboarding: Half-Pipe Physics

By Kate Stone and Jonathan Trinastic Skateboarders might seem to defy gravity as they soar high above a half-pipe, but they are actually taking advantage of specific physics principles that help them reach such heights. GotScience interviews physicist Jonathan Trinastic to learn more. GotScience: As a physicist, what do you see happening in these photos? Dr. Jonathan Trinastic: Skateboarders on a half-pipe take advantage of two primary physics conservation principles: conservation of energy and angular momentum. Let’s start with conservation of energy. Energy can be broken down into two main…

Read More
error: