Back in the old days the frame of the vehicle use to actually be to hollow steel beams that the entire body of the vehicle was mounted to. You could literally take the cabin of the vehicle right off the frame and have just an engine and axles like this;
http://www.everythingmuscle.com/P0014351.JPG
But now days, vehicles use unibody construction where the vehicle body itself is molded to strengthen the vehicle and serves the same purpose as the frame used to;
http://r2v2.com/smart-car-frame2.jpg
Which are a lot safer but in an accident it takes less to consider the car totaled then it does for an older vehicle because most of the damaged parts are not replaceable. I believe trucks and SUV's for the most part still use the old frame design. And even in new cars you can see ruminates of this passed design in what are called the frame rails. Look under your vehicle and about 6 to 8 inches in from the side there is a rectangular beam running from behind your front tire to the front of your back tire on both sides of the vehicle .
It's a sub frame car.
The frame supports the vehicle. Everything bolts to the frame. The body, engine,etc...
It is either a unitized body with the frame built into the car or it is a body on frame construction. A quick look under the car will tell you which it is.
The signs are usually various scrapes or scratches.They may not look very bad but they can weaken the frame causing the car to collaps under the pressure that the damaged frame is putting on the car
A frame is the skeleton of a car without the mountings, were as a chasis is a mounted frame.
The chassis is the frame of the car.
It is the frame work
Depends on the car front wheel drive it a cradle rear wheel drive it a sub frame.
The last time I saw a truck frame under a car, i was in Poland.
Yes
Under engine, if you underneath your car at front you couldn't miss it big steel frame between both wheels
the others in the car.