Force Calculator – Calculate Force Using Newton's Second Law
Calculate force from mass and acceleration using F = ma. This physics calculator helps solve problems involving force, motion, and Newton's laws with instant results in newtons and other units.
Object Properties
Force Results
Enter mass and acceleration to calculate force
Force Examples
Common Forces:
- Apple in hand: ~1 N
- Laptop on desk: ~20 N
- Average adult standing: ~700 N
- Small car weight: ~15,000 N
Acceleration Values:
- Earth gravity: 9.81 m/s² (1g)
- Moon gravity: 1.62 m/s²
- Car braking: -5 to -8 m/s²
- F1 car acceleration: 30+ m/s²
How to Calculate Force
Determine Mass
Find the object's mass in kilograms or convert from other units.
Find Acceleration
Determine the rate of acceleration in m/s² or g-force.
Multiply Together
Force equals mass times acceleration (F = ma).
Features
✓Newton's Second Law
Classic F = ma equation for force calculation in physics.
✓Multiple Mass Units
Support for kilograms, grams, and pounds with auto-conversion.
✓Acceleration Options
Enter acceleration in m/s², ft/s², or g-force units.
✓Force Context
Provides real-world context for calculated force values.
Frequently Asked Questions
What is force in physics?
Force is a push or pull that causes objects to accelerate. Measured in newtons (N), force changes an object's velocity according to Newton's second law.
What is one newton?
One newton is the force needed to accelerate 1 kg at 1 m/s². On Earth, it's roughly the weight of a small apple or smartphone.
How do I calculate weight?
Weight is force from gravity: W = mg. On Earth, multiply mass in kg by 9.81 m/s². A 70 kg person weighs about 687 N.
Is force the same as weight?
Weight is a specific type of force caused by gravity. All weight is force, but not all force is weight. Pushing a box applies force but not weight.
What's the difference between mass and weight?
Mass is the amount of matter (constant everywhere). Weight is the gravitational force on that mass (changes with gravity). Mass is kg, weight is N.