Skip to main content

Net Force Calculator

Science & Engineering

Parallelogram rule · direction angle · special cases

Quick Answer

Net Force Calculator: Parallelogram rule · direction angle · special cases. Net Force Calculator uses standard science & engineering formulas to compute accurate results instantly.

N
N
°
Resultant F5 N
Direction (from F1)53.1°
Max (same dir)7 N
Min (opposite)1 N
Special casePerpendicular: F = √(F1² + F2²) (Pythagorean)

How to combine two forces

  1. 1Parallel rule: place the two forces head-to-tail; the resultant is the diagonal of the parallelogram they form.
  2. 2Formula: F = √(F1² + F2² + 2·F1·F2·cos θ) = √(3² + 4² + 2·3·4·cos 90°) = 5 N.
  3. 3Direction: tan φ = F2·sin θ / (F1 + F2·cos θ), measured from F1 — here φ = 53.1°.
  4. 4Bounds: |F1 − F2| ≤ F ≤ F1 + F2, i.e. 1 N – 7 N for this pair.
  • Three or more forces: combine two first, then combine the resultant with the next (or split every force into x/y components and sum).
  • Same direction F = F1 + F2 (max); opposite F = |F1 − F2| (min); perpendicular √(F1²+F2²). Equal forces at 120° give a resultant equal to either force.
  • If the resultant is 0, the object is in equilibrium (balanced forces) — acceleration is zero per Newton's first law.
  • Newton's second law with the resultant: a = F / m — use the net force, not a single force.

Was this tool helpful?

How to Use

  1. Enter known quantities: fill values and confirm units in the Net Force Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Net Force Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Parallelogram rule · direction angle · special cases.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Net Force Calculator formula

Net Force Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Net Force Calculator?
Open the page and fill in the input fields — results update automatically. Parallelogram rule · direction angle · special cases.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

Related Tools

Related Guides

Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Net Force Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/net-force

Results provided by this tool are for reference only and do not constitute professional advice.