Use the formula: Force = mass × acceleration
Write it as: F = m × a
Measure mass in kilograms
Measure acceleration in meters per second squared
Multiply mass by acceleration
State the force in newtons
Use the formula: Force = pressure × area
Use the formula: Force = work ÷ distance
Use the formula: Force = change in momentum ÷ time
Rearrange the formula if needed to find mass or acceleration
Check that all units are consistent before calculating