Chester’s Racing Car

Chester has built a little wooden racing car with Grandad. Its yellow body looks fast, and Chester is certain it will beat May’s plain red car in their patio race. They set a low ramp on the paving, mark a starting line and agree to let the cars roll without pushing them.

May’s red car travels straight across the patio. Chester’s yellow one curves to the left and stops beside a flowerpot. He tries again, giving it a quick shove this time. It goes farther, but May points out that a pushed car cannot be compared fairly with one that simply rolls down the ramp.

Grandad asks Chester to watch what happens rather than how far the car goes. From the bottom of the ramp, Chester sees the yellow car turning as soon as its front wheels reach the paving. May checks that the ramp is level. Both cars begin in the same place, yet only one curves away.

They carry the yellow car to the table and turn it upside down. One front wheel rubs against the wooden body, while the other spins freely. Chester had painted the car before checking the gap beside each wheel. A small ridge of dried paint is catching the wheel as it turns.

Grandad removes the ridge with a small tool while the children watch from beside him. Chester tests both front wheels again. Now they turn freely, although the car has a little bare patch near the axle. May suggests repainting it later, after they know whether the repair has solved the turning problem.

On the next run, the yellow car rolls straight past the flowerpot. It stops just short of May’s car. Chester wants another try, then notices a dry leaf on the paving where his wheel stopped. They clear the course and repeat both runs, keeping the starting position and ramp height the same.

This time the two cars finish close together. May’s red car is still slightly ahead, but Chester is smiling. His yellow car has travelled straight, and he can explain why. Grandad asks which change mattered most. Chester points to the wheel, rather than the bright paint that had made him so confident before.

They write their results on a card and leave space for another race after lunch. Chester draws a small arrow beside the repaired wheel. “Next time I’ll check how it moves before I choose its colour,” he says. May offers him the red paint anyway, just in case he wants a racing stripe.