I+Noticed....+The+Second+Law

= Today I Noticed That.... = ﻿Examples of the Second Law Of Motion

// Force is equal to mass times exceleration. **F=ma** where F is force, M is mass and A is acceleration. //

The law of Practical Jokes
My family went bowling today (despite my objections - it is my break). My sister was using a 7lb bowling ball, and halfway through the game I got this **//Idea//**. I went looking for a heavy ball and fould the perfect one, right before my sister's turn. Both balls happened to be purple. My sister rolled the light ball and it went and hit a few pins. before she turned around I put the ball I found on the rack. She thought it was her own and picked it up. Thinking it was 7lbs, she rolled my 14lb ball with the same force as her last roll and, because of the increased mass, it accelerated less and nocked over less pins. **A = f x m**. Increase the mass, use the same force, and you get less aceleration. *laugh* I probably could have written this in the experiments page, but I wasnt realy thinking about physics when I did it, nor did I have a goal. I just hoped it would bug my sister.



Backups make sense
Okay, so imagine this. Your driving along the autobahn, half way through an 11 hour drive, board out of your mind, listening to your ipod and starring out the window, and you see an accident. But it is'nt a normal accident. You know those long trucks where the cargo hold detatches from the main part of the vehicle with the engine? The whole long section somehow detaches itself from the rest of the truck. Upart from causing a HUGE backup, the front of the transport speeds up by at least 15 or 20 miles per hour. Why did this happen? I have an idea. **F=ma**, or in this case, **A=fm**. let's just say that the fromt end had 5g of mass and the back had 9g mass (I know that is impossible, but it is easier to explain with smaller numbers), and the engine was using 5 newtons of force to move the truck. 5+9=14, so the mass of the tuck times the force of the engine is moving the truck at 70meters per second per second. so, when the 9g of the rear of the truck came off, it had the same effect as in the example above. Same amount of force, less weight (mass), so the truck moves faster (more acceleration).