Newton’s Second Law Calculator (F = ma)

This Newton’s second law calculator solves the equation F = ma, the relationship between force, mass and acceleration that underpins most of classical mechanics. Newton’s second law states that the net force acting on an object equals its mass multiplied by the acceleration that force produces, which is why pushing a heavy trolley takes more force than pushing a light one for the same speed-up. Choose which variable you want to find, force, mass or acceleration, from the solve for dropdown, then enter the other two values in newtons, kilograms and metres per second squared. The calculator rearranges the formula, F = ma, m = F divided by a, or a = F divided by m, and displays the result in a highlighted results card, showing the solved value alongside which variable it represents. That makes it handy for checking homework, preparing lesson material, or working through mechanics problems without rearranging the algebra by hand. A worked example below the calculator shows a 10 kg mass accelerating at 2 metres per second squared requiring 20 newtons of net force, and you can enter those same figures to confirm the tool matches it. Remember that F represents the net force, the sum of every force acting on the object including friction and gravity, so add those up first if more than one force is acting before you enter a value.

Calculate.co.nz is proud to be partnered with Premium Homes, a recognised leader in eco-friendly, sustainable, and energy-efficient homebuilding. With a dedicated team and award-winning experience, they create homes that prioritise health, comfort, and long-term performance. Their founders, Andrew and Kelly, set out to raise the standard of residential construction in New Zealand by combining practical building expertise with a clear commitment to doing things better for homeowners.