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# Investigating The Stopping Distance Of A Toy Car

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Introduction

Investigating The Stopping Distance Of A Toy Car PLANNING: During the course of this investigation i will aim to find how one specific factor effects the stopping distance of a toy car down a ramp. The factors which effect stopping distance are; Tyres, Brakes, Road surface, Speed of car, the Aerodynamics etc. The toy car will model a real car with frictional forces between the bench top and the wheels acting as brakes. I will choose to investigate the effect of speed because it is the most easily varied. To change the speed of the car i can alter the height at which the car falls from. This is done by adding or subtracting blocks which make up the height of the ramp. Speed will be measured by using a light gate, and the stopping distance of the car will be measured using a ruler. ...read more.

Middle

this will cause the car to crash into the bench rather than rolling down the ramp and then along the bench top. Speed will be measured using the formula, speed = distance travelled. Time taken Predictions: The higher the speed of the car, the higher the stopping distance. This is because at higher speed there will be higher kinetic energy belonging to the car. Therefore it will take longer for frictional forces acting on the car to put it to rest. I can show this using formulae: Loss in kinetic energy = work done by frictional forces 2 1/2 MV = F x d By rearranging this 1/2 Mv formula i can get: D= F x 2 = D= M 2F So to find the theoretical stopping distance of the car I can use the above formula. If we assume that everything remains constant i.e the frictional forces acting upon the car, the stopping distance must be proportional to the speed of the car. ...read more.

Conclusion

Braking distance has been multiplied by 4. If the speed trebles from 20mph to 60mph the braking distance is multiplied by 9. Implementing The experiment was performed, whereby the car was dropped from varied heights, and the times which the car took to go through the light gate were noted. The stopping distance was also recorded, and each measurement was performed three times so that an average could be made to produce more thorough results. Height(m) Time on the light gate(secs) Stopping Distance(m) 1 2 3 Average 1 2 3 Average 0.01 0.592 0.598 0.595 0.595 0.150 0.170 0.190 0.170 0.02 0.271 0.538 0.481 0.430 0.350 0.350 0.360 0.350 0.03 0.191 0.182 0.185 0.185 0.650 0.610 0.500 0.600 0.04 0.170 0.170 0.164 0.168 0.821 0.720 0.780 0.770 0.05 0.147 0.142 0.127 0.139 0.880 0.910 0.940 0.910 0.06 0.142 0.135 0.131 0.136 1.020 1.060 1.110 1.060 0.07 0.133 0.136 0.134 0.134 1.110 1.140 1.180 1.140 0.08 0.132 0.121 0.129 0.127 1.200 1.210 1.180 1.190 ...read more.

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