What is Newton's second law of motion?

Newton's second law states that the force acting on an object is equal to the mass of that object multiplied by its acceleration (F = ma). This calculator applies that principle to compute force when you provide mass and acceleration.

What units does the Force Calculator use?

The calculator uses standard metric units: mass in kilograms (kg), acceleration in meters per second squared (m/s²), and force in newtons (N). Ensure your inputs are in these units for accurate results.

Can I use this calculator for any object?

Yes, as long as you know the object's mass and its acceleration. It works for any scenario where Newton's second law applies, from a car accelerating to a rocket launching.

物理

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力的计算器.

2026年8月4日

牛顿第二定律计算力

此计算器尚未完全翻译——部分文本以英文显示。

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02 / 答案

Mass

Acceleration

Velocity (opt)

Distance (opt)

Force

20N

体重

98.1N

Cite this calculator

Canonical URL: https://mathify.one/zh/physics/force

Updated 2026年8月4日

Cite as: Mathify. (2026). 力的计算器. https://mathify.one/zh/physics/force

Use Cases

Physics Homework and Problem Solving

Quickly verify force calculations for physics assignments or exam practice. Enter mass and acceleration to see the resulting force in newtons.

Example: A 5 kg object accelerates at 2 m/s², so force = 10 N.

Engineering and Design Calculations

Estimate the force needed for mechanical systems, such as determining the thrust required for a vehicle or the force on a structural component.

Example: Calculate the force needed to accelerate a 1000 kg car at 3 m/s².

Frequently Asked Questions

What is Newton's second law of motion?: Newton's second law states that the force acting on an object is equal to the mass of that object multiplied by its acceleration (F = ma). This calculator applies that principle to compute force when you provide mass and acceleration.
What units does the Force Calculator use?: The calculator uses standard metric units: mass in kilograms (kg), acceleration in meters per second squared (m/s²), and force in newtons (N). Ensure your inputs are in these units for accurate results.
Can I use this calculator for any object?: Yes, as long as you know the object's mass and its acceleration. It works for any scenario where Newton's second law applies, from a car accelerating to a rocket launching.

Tips & Common Mistakes

Tips

Ensure mass is in kilograms (kg) and acceleration in meters per second squared (m/s²) to get force in newtons (N).
If you have weight (in newtons) instead of mass, divide by 9.8 m/s² to get mass in kg.
Remember that force is a vector; this calculator gives magnitude only.
Double-check your acceleration value: it should be the net acceleration, not just the applied acceleration if other forces are present.

Common Mistakes to Avoid

Using grams instead of kilograms for mass, leading to force values that are off by a factor of 1000.
Confusing mass and weight: weight is a force (mass × gravity), so using weight directly as mass is incorrect.
Forgetting to convert acceleration from km/h² or other units to m/s².

Last updated: August 13, 2026