Fair Test of the Fair Test of the FRICTION OF BallsFRICTION OF Balls on a rampon a ramp

Aim Prediction Method

Results Conclusion

AimAim

To see which ball has more To see which ball has more friction on a ramp.friction on a ramp.

PredictionPrediction

Jiyong Table tennis ballJiyong Table tennis ball

Evan Mini tennis ball Evan Mini tennis ball

VariablesVariables

Slope of the rampSlope of the ramp SizeSize weightweight gripgrip type of the balltype of the ball DegreesDegrees

EquipmentEquipment

RampRamp Stopwatch/Shos’ watchStopwatch/Shos’ watch BenchBench Balls ; tennis ball, basketball, Balls ; tennis ball, basketball,

table tennis ball, rugby ball, table tennis ball, rugby ball, squash ball, cricket ball, netball, squash ball, cricket ball, netball, golf ball and mini tennis ball.golf ball and mini tennis ball.

MethodMethod

Step 1 Get a ramp and many different Step 1 Get a ramp and many different balls i.e. table tennis ball and rugby balls i.e. table tennis ball and rugby ball etc.ball etc.

Step 2 Get a stop watch Step 2 Get a stop watch Step 3 Set the ramp up against a Step 3 Set the ramp up against a

bench on a 50 degree angle.bench on a 50 degree angle. Step 4 Put the first ball on the top Step 4 Put the first ball on the top

then let it go and time how long it then let it go and time how long it takes to reach the bottom. takes to reach the bottom.

Method 2Method 2

Step 5 Do it again and see what Step 5 Do it again and see what time it is with the same ball and if time it is with the same ball and if it is a different time then average it is a different time then average out the time. out the time.

Step 6 Do it with other balls, we Step 6 Do it with other balls, we used nineused nine

Step 7 Have and see if Step 7 Have and see if your prediction is right.your prediction is right.

BallsBalls TimeTime

Rugby BallRugby Ball 1.03 seconds1.03 seconds

BasketballBasketball 1.075 seconds1.075 seconds

NetballNetball 1.13 seconds1.13 seconds

Soccer ballSoccer ball 1.16 seconds1.16 seconds

Little tennis ballLittle tennis ball 1.1 seconds1.1 seconds

Golf ballGolf ball 1.015 seconds1.015 seconds

Tennis ball 1Tennis ball 1 1.18 seconds1.18 seconds

Cricket ballCricket ball 1.24 seconds1.24 seconds

Table Tennis ballTable Tennis ball 1.30 seconds1.30 seconds

Squash ballSquash ball 1.145 seconds1.145 seconds

Tennis ball 2Tennis ball 2 1.06 seconds1.06 seconds

ConclusionConclusion

We found out that the table We found out that the table tennis ball was slower which was tennis ball was slower which was Jiyong’s prediction so it must Jiyong’s prediction so it must mean that Jiyong is a genius and mean that Jiyong is a genius and the table tennis ball encounters the table tennis ball encounters more friction. more friction.

VideoVideo

The EndThe End

Thank Philip for videoing Thank Philip for videoing