Newton's Second Law states that force equals mass times acceleration ... kept constant. To increase the force on the trolley, you will add masses to the hanger. As the mass of the whole system ...

The large Σ (the Greek letter sigma) represents the vector sum of all the forces, or the net force, acting on a body. It is rather difficult to imagine applying a constant force to a body for an ...

We’re going to investigate how the resultant force ... the trolley’s acceleration. Speaker one One of our control variables is the overall mass of the system. To keep this constant, when ...

Now suppose I want to find the acceleration ... of mass 2? The answer is simple — mass 2 is not in equilibrium but instead it is accelerating downward. Since it's accelerating, the net force ...

When we first began formulating physical laws, we did so empirically: through experiments. Drop a ball off a tower, like Galileo may have done, and you can measure both how far it falls and how ...