Centripetal Force Calculator
Centripetal force magnitude = mass × speed² / radius.
Open toolSigned Coulomb force = ke × q1 × q2 / distance². Point charges in vacuum.
Enter the inputs, then select Calculate.
Result will appear here
Signed Coulomb force = ke × q1 × q2 / distance².
Point charges in vacuum. Positive means repulsion; negative means attraction. ke = 8.9875517923 × 10⁹ N·m²/C². Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
Follow the labelled inputs.
Replace the example with first charge (c). The field labels specify the expected format and units.
Select Calculate. Review the calculated result, then copy it or download the result text.
The starting example produces 0.0179751035846 N. Signed Coulomb force = ke × q1 × q2 / distance².

Read the labels for first charge (c) and second charge (c), separation (m). Point charges in vacuum.

Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.

Read the units and assumptions with the output.
Signed Coulomb force = ke × q1 × q2 / distance².
Point charges in vacuum. Positive means repulsion; negative means attraction. ke = 8.9875517923 × 10⁹ N·m²/C². Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.

Check the stated scope before you run it.
Point charges in vacuum. Positive means repulsion; negative means attraction. ke = 8.9875517923 × 10⁹ N·m²/C². Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
The input stays in this browser. Copy result and Download save the same displayed text.

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Point charges in vacuum. Positive means repulsion; negative means attraction. ke = 8.9875517923 × 10⁹ N·m²/C². Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
Use Copy result to copy the displayed text, or Download to save it as a text file. The tool runs in your browser and does not require an account.
Check the calculated result, then copy or download it.