Push a cart along a track. Change the push, the mass and the surface, then watch the forces, the acceleration and the motion graphs. Then try the challenges.
Level track: N = mg (g = 9.81 m/s²)
friction0
F_net0
a (m/s²)0
v (m/s)0
x (m)0
t (s)0
velocity v (m/s) vs time
acceleration a (m/s²) vs time
Challenges
All challenges done! You've seen the First Law (C4), the Second Law (C1, C5) and static vs kinetic friction (C2, C3).