Went through kinetics and motion test - see previous post for both question paper and mark scheme. Thinking Distance = distance covered between first seeing an object in the road and applying the brakes Braking Distance = distance covered between applying the brakes and stopping Stopping Distance = Thinking Distance + Braking Distance The thinking distance can be calculated using the simple equation: thinking distance = speed x reaction time (assuming constant speed) We generally assume that when the car is braking that the acceleration is constant. Hence, a velocity time graph would look like that shown below: Factors affecting thinking distance are: speed and reaction time (affected by: age, alcohol, drugs, tiredness, distractions)
Factors affecting braking distance: speed, mass, type of road surface, quality of tyres and brakes, weather conditions (i.e. wet or icy), gradient of road [for each of these, how do you think it affects the braking distance?] Assuming a constant deceleration, we find that braking distance is proportional to velocity (see future section on Work and Kinetic Energy) Answer question 3 from page 75 (answers in next lessons blog post): Leave a Reply. |
Archives
December 2015
Categories |