the friction caused by the road agianst tires
a sports car and a bus are both traveling at 30 km/h. which of the two will require more force to stop?why?
Friction
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When a vehicle is slowing down, the external force of friction between the brakes and the wheels is what changes its momentum and kinetic energy. This force works against the vehicle's motion, transferring kinetic energy into heat and bringing the vehicle to a stop. The force of the brakes is an internal force that generates friction to slow down the vehicle.
The more the vehicle weighs, the harder the brakes must work to stop it and the more distance it will need to stop the vehicle. However, large trucks can brake easier with more weight because weight adds friction which helps to stop the vehicle. This still doesn't fully compensate for the total stopping distance needed for a large vehicle. Basicly what he means is the heavier the vehicle the more friction it can create(slow it down) but it can add to the forward force iswell Or more precisely, the force of the vehicle going forward because of it's mass is still greater than the force of friction helping the vehicle slow down.
No, a speedometer is used to measure the speed or velocity of an object in motion, usually a vehicle. It does not measure force directly. Force is typically measured using instruments such as a dynamometer or a force gauge.
Yes, the parking brakes can be used to stop the vehicle in emergency. But remember that, in most of the vehicles parking brakes apply only to one pair of wheels, so if the vehicle is in high speed, one has to apply them carefully and save the vehicle from skidding.
FRiction
Centripetal force acts on all masses subjected to the cornering force. The whole vehicle has centripetal force acting on the tires, via friction, allowing the vehicle to corner. If you are free to move within the vehicle, yes, the door will stop you being flung outward.
By allowing an increase in stopping distance, the kinetic energy of the vehicle can be reduced. This reduction in kinetic energy results in a slower deceleration of the vehicle, which means a lower force is applied to bring it to a stop. As a result, the momentum of the vehicle is offset, as it takes longer to come to a complete stop.
Rolling the ball would be work and stopping the ball would be force.
A runaway vehicle ramp is a safety feature typically found on downhill sections of highways or mountain roads. It is designed to stop a vehicle that has lost control and is unable to stop on its own, by allowing the vehicle to gradually come to a safe stop in a designated area filled with materials like gravel or sand.