Lesson 25
In Class 25.1 SUV
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6/194. The phenomenon of vehicle tipping is
investigated in this problem. The vehicle is sliding
sideways with speed v
1
and no angular velocity when it
strikes a small curb.
Assume no rebound of the right
side tires and estimate the speed v
1
that will cause the
vehicle to roll completely over to its right side.
Mass is
2300 kg, I
G
is 900 kg m
2
. What v to make it tip?
Deals with impacts, so probably need impulse
momentum.
A rigid body, so will definitely need to
do angular
– lets start there, then we’ll see if we
need to do linear too.
Why did we choose angular momentum about A?
That is where the force acts, so will drop out of
moment equation.
Also this is a fixed point of
rotation during the tipping.


What terms?
Used the parallel axis
theorem to find I
A
The
negative sign means it the
angular momentum is in the
negative z (think r x mv).
Have w in terms of v1.
How do we figure if it tips?
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 Spring '05
 staff
 Angular Momentum, 900 kg, 11 miles, 2300 kg, 4.88 m/s

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