Newton third law calculator

Calculate reaction force on B and acceleration B due to interaction with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use reaction force on B and acceleration B due to interaction to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Mass A (kg)
90
Acceleration A due to interaction (m/s²)
20
Mass B (kg)
30
Reaction force on B (N)
-1800
Acceleration B due to interaction (m/s²)
-60

Try another scenario

Mass A (kg)
99.00000000000001
Acceleration A due to interaction (m/s²)
20
Mass B (kg)
30
Reaction force on B (N)
-1,980
Acceleration B due to interaction (m/s²)
-66
Calculation method

Calculation method

Reaction force on B (N)

-a × b

Acceleration B due to interaction (m/s²)

-a × b ÷ c

Symbols and units
a
Mass A (kg)
b
Acceleration A due to interaction (m/s²)
c
Mass B (kg)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • The paired forces act on different bodies. The acceleration relation uses only the paired interaction force; other forces must be accounted for separately.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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