The braking force of the vehicle has a great influence on driving safety. The better the brakes, the easier it is to slow down in front of a sudden obstacle.
It is necessary
- Straight dry and level road
- Construction tape
Instructions
Step 1
Find a straight section of road with little traffic. The asphalt should be smooth, without holes or patches. A slope in any direction is undesirable. Examine the roadbed. Remove debris and other objects, the presence of which may affect traffic safety. Set a highly visible milestone. It marks the place where you want to start braking.
Step 2
Use a GPS navigator to measure your speed. Car speedometers often underestimate real speed by 5 kilometers or more. The higher the speed of the machine, the lower the accuracy of the readings. Braking distance measurements are usually taken at a speed of 100 kilometers per hour. Position the machine on the road in such a way that it is guaranteed to pick up the required speed to the milestone. Try to find an assistant who will monitor the speed of the car.
Step 3
Make sure that there are no obstacles in the way of the vehicle. Start overclocking. At this time, the assistant must monitor the speed on the navigator screen. As soon as the car accelerates to the required speed, it will give a signal. Then move without acceleration. As soon as the vehicle is level with the milestone, start braking until the vehicle comes to a complete stop. Try not to block the wheels. If a skid occurs, release the brake immediately.
Step 4
Measure the distance from the pole to where the vehicle stops. It is advisable to repeat the experiment at least three times. Add up all the results, divide by the number of attempts. We write the average value of the stopping distance through h. Then the work spent on braking: A = F * h, hence F = A / h. Now let's express the work through the speed and mass of the car: A = mV² / 2, where m is the mass of the car, kg; V - initial speed equal to 100 km / h. Substituting the work into the first formula, we get an expression for determining the braking force through the braking distance, initial speed and mass of the car: F = mV² / 2h
Step 5
Substitute the values obtained as a result of the experiment into the formula, perform arithmetic operations.
