What happens to resultant force when vehicle travelling at constant speed?
It is zero
What is driving force equal and opposite to?
(air resistance between tyres and road)
What happens the faster the vehicle?
Bigger the deceleration needed to bring it to rest at a particular distance
What is needed to produce a greater deceleration?
Greater braking force
What happens the greater the mass?
Greater the braking force needed to produce a greater deceleration
What is a stopping distance of a vehicle?
Distance it travels during the driver's reaction time(thinking distance)
What is braking distance?
Distance it travels under the braking force
How is thinking distance increased?
If driver is :
under the influence of alcohol/drugs
using a mobile phone
How can the braking distance be increased?
By poorly maintained roads
Bad weather conditions
Poorly maintainrd vehicles (e.g worn tyre/brake)
How can you calculate deaccerletation of a vehicle?
v2 = u2 + 2as
v = final speed m/s
u = inital speed m/s
a = acceleration in metres per second squared
s = distance m