Force Calculator (F = m·a)
Newton's second law: enter mass and acceleration, get force in newtons. Step-by-step working and pound-force conversion shown.
Result
Force
98.100 N
- In pound-force22.054 lbf
- In dynes (CGS)9,810,000 dyn
Step-by-step
- Apply Newton's second law: F = m × a.
- Substitute: F = 10 kg × 9.81 m/s² = 98.100 N.
- Convert to pound-force: 98.100 N × 0.2248 = 22.054 lbf.
How to use this calculator
- Enter the mass of the object in kilograms.
- Enter the acceleration in m/s². Use 9.81 for objects in free fall near Earth.
- Read force in newtons, plus pound-force and CGS unit conversions.
About this calculator
Newton's second law states that the force on an object equals its mass times its acceleration. F = m·a is the foundation of classical mechanics: pushing a 10 kg box at 2 m/s² requires 20 N; lifting a 1 kg book against gravity requires 9.81 N. The unit of force, the newton, is defined exactly as the force needed to accelerate 1 kg at 1 m/s². For everyday intuition: 1 N is roughly the weight of a small apple. This calculator returns force in newtons, pound-force (engineering use), and dynes (CGS / particle physics).
Frequently asked
1 newton is roughly the weight of a small apple (~100 g) under Earth gravity. It is the force needed to accelerate 1 kg at 1 m/s².
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