Newton's 2nd Law

A resultant force causes acceleration — F = ma

Newton's 2nd Law — F = ma
A single constant force acts on the trolley. The greater the force, or the smaller the mass, the greater the acceleration.
Set F and m with the sliders, then press Launch to see F = ma in action.
a = 0 m/s²
F = m × a
Force F 40 N
Mass m 4 kg
Resultant Force
When forces are balanced the trolley moves at constant speed. When unbalanced, it accelerates or decelerates.
Set drive force and friction with the sliders, then press Launch.
F_net = 0 N
F_net = F_drive - F_friction
Drive F 60 N
Friction 20 N
Mass m 5 kg