2 questions regarding traction and accidents

Yes and no. Light is both a partical and a wave, so while it has no mass, it can have momentum. It is a complex idea that I cannot explain, but enjoy

Does light have mass?

 

Found this picture shows an empty truck stops sooner than a loaded truck under ideal conditions.
On snow or ice it maybe different. Certainly it is trickier when empty in the winter.

 

I think we have got a bit off the subject here. The thing is a truck loaded at 75,000 pounds going 60 MPH is going to do some damage if it hits something. The weight and speed work against each other. I think the question is about stopping. Well, I have had empty trucks to slide and become a bit unstable and this, in turn, has caused some extra stopping distance. I never really like being empty or bobtail because of the truck always not settling in the suspension and the tires were not fully down. You can see this principle with some flatbeds and other drop decks with tires mounted so if the vehicle was empty the tire was off the ground. Yes, a truck that is loaded has weight. this weight adds to the force needed to stop it. However, the truck is built to handle this weight. They stop better and are more stable in doing so. I even have taken note of my loaded truck driving better in the snow. A loaded truck is just better all the way around. I see this subject has been discussed before.

 

I'm sure it has a very simple explanation.
I don't have it, but neither does that link you provided. That whole things just said... we are just as confused and confounded as you.

It is probably just as simple as time being the equal and opposite force to gravity, instead of just a relative measurement to how we perceive things.
I just wish I could comprehend the proper context of it.

 

Yes, I always found I needed to apply more foot pressure to stop when bobtailed.

 

I wish somebody would put this idea to the test, or maybe they already have, and it’s up on YouTube. Who knows.

From my personal experience, you should be able to stop faster when fully loaded (80k) on a wet or icy road. However, I am not very sure if that would be the case on a leveled dry road. I am aware CDL handbooks say a loaded truck will stop faster.

If you’re empty, and hit the brakes hard on an icy surface, the vehicle won’t stop at all. It will just slide. If you hit the brakes hard on a wet surface, the vehicle can jump repeatedly and slide, and it can travel a bit to the right or left. On a dry surface, the vehicle will jump repeatedly. Now, if you wanted to brake as fast as possible while empty, the key is to brake gradually. The wetter or icier the roads, the more gradually.

 

No. Landmark is the little bone wedge at the base of your front ribs where it meets. At that point your liver and important stuff is underneath it. A certain distance above that sits your heart and that would be where you apply the compressions.

The CPR training I recieved that many years ago is not like what they train people today. So there is a certain amount of compression and then breaths and back to compressions etc for one person and if you had two, one breathing and the other compressing then the counts will be a little different. At some point you two will have to switch.

The third problem of CPR is you want a solid floor or ground under the victim. and it's not something you ever do on a living person with a functioning heart. Ever. We learned ours on mannequins that were computer driven and had the necessary parts to accept the breathing and so forth.

I try to keep things simple but it's sometimes either too much or too little. In this case it was better that I just said that I decided not to do it on that one gentleman. The policeman proceeded with the situation until the help came along. We were rolling down the road by then because there was a awful lot of help showing up and its time to get going.

If you wanted a thought about this one, I don't think he made it. He was down too long. but his wife was in a pretty bad way herself and it would be something that can be fixed but healing from that would be months if not more than a year.

 

It’s called a bobtail proportioning relay valve. It reduces service air going to the brakes when bobtailing, meaning you have to press harder on the pedal than you would when pulling a trailer to slow or stop.