curl --request POST \
  --url https://api.iotools.cloud/v1/tool/friction-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "unitSystem": "metric",
  "normalMode": "weight",
  "mass": "10",
  "material": "steel-steel-dry",
  "appliedForce": "50"
}
'

{
  "tool": "friction-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "summary": "Stationary — static friction holds at 50.00 N (max 72.57 N)",
    "forcesTable": [
      {
        "quantity": "Normal force (N)",
        "value": "98.07 N"
      },
      {
        "quantity": "Max static friction (μs·N)",
        "value": "72.57 N"
      },
      {
        "quantity": "Kinetic friction (μk·N)",
        "value": "55.90 N"
      },
      {
        "quantity": "Applied force",
        "value": "50.00 N"
      },
      {
        "quantity": "Friction force (actual)",
        "value": "50.00 N"
      },
      {
        "quantity": "Net force",
        "value": "0.00 N"
      },
      {
        "quantity": "Acceleration",
        "value": "0.00 m/s²"
      },
      {
        "quantity": "Angle of repose (atan μs)",
        "value": "36.5°"
      }
    ],
    "notes": "The 50.00 N applied force stays under the maximum static friction of 72.57 N, so the object doesn't move — friction exactly cancels the push.\nAngle of repose ≈ 36.5° — the incline angle at which gravity alone (no push) would start this pair sliding, from tan(θ) = μs.\nMass, m = 10.00 kg."
  },
  "credits_used": 5,
  "credits_remaining": null
}