What causes sparks on f1 cars?

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Tags

1. #titanium
2. #pushes
3. #plate
4. #along
5. #compressing
6. #produce
7. #travelling
8. #harder
9. #sparks
10. #speed
11. #downforce
12. #there
13. #suspension
14. #underneath
15. #producing
16. #ground
17. #causing