Mass is measured in kilograms (kg) or grams (g)., if the resultant force remains constant. Use an accelerating force of 5 N and keep this constant. Record acceleration as additional 0.5 kg masses ...

You can use this set-up to investigate how changing two separate factors, mass and force on the trolley, will affect the acceleration. In both investigations, you will measure the acceleration, so ...

Also, the acceleration will be less than g (9.8 m/s 2) since the equation says to multiply g by the difference in the mass divided by the sum of the mass. Again, this is good. OK, let's do it ...

The Connecting Formula: Newton's Second Law. The relationship between mass and force is expressed in Newton's second law of motion: Force (N) = Mass (kg) x Acceleration (m/s²) ...

Newton’s Second Law of Motion states, “The force acting on an object is equal to the mass of that object times its acceleration.” ...

I assume the laws of physics still apply in "unintended acceleration." In particular, F=ma, "force equals mass times acceleration," implies that acceleration depends on a continued applied force.