What’s the claim of the experiment?

Question

As mass increases, acceleration decreases. When I ran a cart down a track, I measured the acceleration to be 15m/s2. I added 5 grams to the cart, and the acceleration decreased to 10m/s2. Then, I added 5 more grams to the cart and the acceleration decreased to 5m/s2. As you can see from the data, each time I added more mass to the cart, the acceleration went down, indicating that the mass and the acceleration of the cart have an indirect relationship. According to our text book, "The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object." This means that as you increase mass, acceleration decreases.

Answer 1

The force causing the cart to roll down the ramp is mg(sin θ), so when you add additional mass, m’, the increase in [m +m’]g(sinφ) is greater than [m + m’]a, so acceleration increases.