How far will the car skid with locked brakes at 132 km/h? Assume that energy loss is due only to sliding friction.?
This question is typical on some driver’s license exams: A car moving at 44 km/h skids
16 m with locked brakes.
How far will the car skid with locked brakes
at 132 km/h? Assume that energy loss is due
only to sliding friction.
Answer in units of m
- Steven SLv 78 months ago
To many variables. What are the conditions of the roads, weather and tire tread wear?
- oubaasLv 78 months ago
d' = d*(V'/V)^2 = 16*(132/44)^2 = 16*3^2 = 144 m
- Anonymous8 months ago
KE is proportional to the speed squared.
(132 / 44 )^2 * 16 m
- StarryskyLv 78 months ago
That would be a direct relationship, or 132/44 times farther. That would be at least 3 times farther, or 48m.
That is within the expected length from the many stopping tests I have seen of new vehicles with ABS. At 60 mph or 100 km/h, distances were about 110 feet or 34m. Might have been shorter or longer with locked brakes.