To measure the force of something, you must first learn the formula for force. It is force which is equal to the mass times the acceleration. The mass should be written in kilograms. If the mass is not written in kilograms, then it should be converted. These are called the International System of Units. Now plug in the mass number and the acceleration number. Then multiply those two numbers together.
If you have the mass and force and need to find the acceleration, then that can be done too. You will divide the force by the mass to get the acceleration. There are differences between weight, force and mass. Weight is only a force when the force is caused by a gravitational object.