U1: Small inclined plane
Pendulum bobs
Springs
Hooke's Law Apparatus
U2: Carts
Pasco track carts
Car
Ball launching cart
Fan cart
Double ball launchers
U3: Liquid accelerometer
Bocce balls
Pingpong balls
Foam balls
Marbles
U4: Nerf balls
Blow up balls
Hollow balls
Large pulleys
Balls