Apply F = ma, friction, tension, and inclined plane problems with full working.
A Newton's laws calculator computes forces, accelerations, and reaction forces in mechanical systems — from a single particle to coupled masses on pulleys or inclined planes. Newton's three laws form the foundation of classical mechanics and accurately describe everything from human-scale motion up to planetary orbits.
The most-used equation is the second law, F = ma, but the first (inertia) and third (action-reaction) laws are equally essential for setting up free-body diagrams correctly.
\vec{F}_{net} = m \vec{a}
Inputs: 5 kg block on a frictionless 30° ramp
The action-reaction pair acts on DIFFERENT bodies. When you push a wall, the wall pushes you back with equal force — but the two forces do not cancel because one is on the wall and one is on you. Students confuse this with Newton's first law (net force on a single body) where opposing forces on the same body do cancel.
At very high speeds (close to the speed of light) — replaced by Einstein's special relativity. At very small scales (atomic and subatomic) — replaced by quantum mechanics. In strong gravity (near black holes) — replaced by general relativity. For all everyday engineering and physics on Earth, Newton's laws are extremely accurate.
EMI Calculator Mortgage Calculator SIP Calculator Compound Interest GST / VAT Calculator Salary Calculator Unit Converter Currency Converter Scientific Calculator Concrete Calculator Paint Calculator Tile Calculator Calorie / TDEE Body Fat Macro Calculator O-Ring Sizes Bolt & Nut Sizes Pipe Sizes Wire Gauge AWG Needle Gauge Chart IV Cannula Sizes Suture Sizes Catheter French Sizes Drug Dosage See all 90+ calculators ›