- #1
jaguar ride
- 22
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Homework Statement
Apologies in advance if this problem has been brought here before, I searched and couldn't find it.
The automobile has a mass of 1.7 Mg and center of mass at G. Both the front and rear brakes are locked.
Take μs = 0.3
Determine the towing force F required to move the car.
Homework Equations
ΣM = 0
ΣFx = 0
ΣFy = 0
friction = μs * normal force
The Attempt at a Solution
The previous question to this was identical (although with different values), but with only the rear brakes locked. I summed the moments about A to find the reaction at B (normal force), and then multiplied that by the coefficient of static friction to find the frictional force, and solved for F using the horizontal force equation.
I tried the same approach for this problem. Summed the moments about A to find the reaction at B, and summed the forces in the Y-direction to find the reaction at A. I then multiplied those by the coefficient of friction to find their respective frictional forces. Then I summed the forces in the X-direction to solve for F. Wrong.
Clearly this approach is incorrect. Am I way off?
My thoughts are: the frictional force at A is greater than at B, will that have an effect? Does tipping somehow come into play in this problem?
Thanks in advance for any help you can offer. I tried to follow the guidelines, but I can show more work if need be.