Can Loose Objects in a Car Cause Serious Injury? A Newton's First Law Experiment

AI Thread Summary
The discussion revolves around creating a presentation that illustrates the dangers of loose objects in vehicles, using Newton's first law of motion as a foundation. Participants suggest various demonstration ideas, emphasizing the importance of safety. One participant shares a personal anecdote about a dangerous experience involving heavy tools in a vehicle, highlighting the potential consequences of loose objects during accidents. A safer demonstration is proposed, involving a clear plastic enclosure on a cart containing an egg and a dense object, which effectively showcases the principles of inertia and the risks associated with unsecured items in cars.
Steph
Hey there everyone

I need to do a presentation that shows the danger of having loose objects in the car...using Newton's first law...i'm stuck for ideas, we have to make some experiment like an egg on a trolley or something...does anyone have any ideas?

Steph
 
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If the loose object is a rattlesnake the demo is pretty easy. :wink:

Njorl
 
I once hitched a lift in a lorry carrying over 20 tons of steel bars on a flatbed right behind the cab.
The driver had never heard of Newton's first law. I guess that's why he took the job.
 
My brother-in-law once did just such a demonstration himself. He had a tool-box full of heavy stuff like wrenches, hammers, chisels, etc on the floor of the cab of his pickup and he missed a curve and rolled his truck in the ditch. That toolbox beat the crap out of him. To add to the authenticity, he wasn't wearing his seat-belt (never does!). I'm surprised he's still alive.

You could do a safer demonstration using a clear plastic enclosure on a cart with an egg and a ball-bearing or a large hex nut or some other dense object inside.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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