The discussion revolves around calculating the stopping distance of a car based on its speed, specifically comparing a car skidding to a halt from 50 km/h and 150 km/h. The scope includes theoretical reasoning and mathematical calculations related to physics concepts such as kinetic energy and friction.
Participants express differing views on the calculations and the type of friction involved in skidding. There is no consensus on the stopping distance or the effects of air resistance.
The discussion includes assumptions about the forces acting on the car and the simplifications made in the calculations. The impact of air resistance on stopping distance remains unresolved.
The car does work in skidding: Work = Force*distance where Force is the kinetic friction force. Friction is a function of the normal force, which does not change. So Work is proportional to Distance of the skid.janes3kids@yahoo.com said:I got this one wrong on a test and I am debating it.
A car going 50 km/h skids to a halt going 20m. If the same car is going 150km/h how far will it skid til it comes to a halt.
a)20m b) 60m c) 180m
"skidding" implies that the tires slide against the ground (the wheels are locked), so there is slipping between the contact surfaces and kinetic friction applies. If the car stopped without skidding, then the tires would roll without slipping and static friction would apply.whozum said:Don't mean to be picky but since the car is 'skidding', the tires arent moving and its static friction.