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Online Force Calculator
Calculate force, mass, or acceleration using Newton's second law, F = ma, with a choice of units.
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What Is This Tool?
The Force Calculator applies Newton's second law, F = ma, to find force, mass, or acceleration when you know the other two. Choose what to solve for, enter the known values with their units, and it returns the answer. For example, a mass of 80 kg accelerating at 10 m/s² experiences a force of 800 N.
How to Use This Tool?
- Choose whether to find F, m, or a.
- Select the unit you want for the answer.
- Enter the two known values with their units.
- Click Calculate to see the result.
Key Features
- Solves for force, mass, or acceleration.
- Supports many force, mass, and acceleration units.
- Converts mixed units automatically.
- Handles negative values for direction.
- Shows the result with its symbol and unit.
Examples
- 80 kg at 10 m/s² gives a force of 800 N.
- 35 N on a 10 m/s² acceleration gives a mass of 3.5 kg.
- 950 N on a 90 kg mass gives an acceleration of about 10.56 m/s².
- 1 kg at 1 m/s² is exactly 1 newton.
Common Use Cases
- Solving Newton's second law problems.
- Finding the force needed to accelerate an object.
- Working out an object's mass from a known force.
- Estimating acceleration from an applied force.
- Checking physics and engineering homework.
Tips & Best Practices
- Select the correct unit for each value before calculating.
- Use the newton for force and the kilogram for mass in SI.
- Mass cannot be zero when solving for acceleration.
- Acceleration cannot be zero when solving for mass.
- Use a negative value to represent force in the opposite direction.
Limitations
- It models a single net force on a constant mass.
- Mass and acceleration cannot be zero when used as divisors.
- It does not account for friction or other forces separately.
- Results are rounded for display.
Frequently Asked Questions
- What is the formula for force?
- Force equals mass times acceleration, written F = ma. This is Newton's second law of motion.
- What is a newton?
- A newton is the SI unit of force, equal to the force that accelerates a 1 kg mass at 1 m/s².
- How do I find acceleration from force?
- Rearrange the formula to a = F ÷ m. Enter the force and mass, and the calculator solves for acceleration.
- Is weight the same as force?
- Weight is a force caused by gravity, equal to mass times gravitational acceleration, about 9.81 m/s² on Earth.
Key Terminology
- Force
- A push or pull that can change an object's motion.
- Mass
- The amount of matter in an object, measured in kilograms.
- Acceleration
- The rate at which an object's velocity changes.
- Newton
- The SI unit of force, equal to one kg·m/s².
- Newton's second law
- The principle that net force equals mass times acceleration.