# 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

### 4 Answers

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- Steven SLv 78 months ago
To many variables. What are the conditions of the roads, weather and tire tread wear?

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- Anonymous8 months ago
KE is proportional to the speed squared.

(132 / 44 )^2 * 16 m

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- 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.

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