3. The motion of an object going down a slope (Newton's second and third law)
Make an inclined plane (slope) using a wooden block and a wooden board on the large-size wooden
dynamic cart (a) and put the metallic dynamic cart (b) on the inclined plane (see Fig. 3). While the
metallic cart (b) is going down the inclined plane, the motions of the wooden cart (a) and the metallic
cart (b) can be demonstrated to learners. Consequently, the wooden cart (a) will move backward when
the metallic cart (b) will move forward in Fig. 4.
The purpose of the demonstration using two carts (a and b) is that learners analyze what forces drive
the carts movement in the demonstration.
Fig. 3 Fig. 4
Description of Metallic dynamic cart DY-5 (C15-1622-W0)
①
Plunger and its shaft
②
Plunger Launcher
③
Screw hole for a force sensor
④
Knob of anti-moving stopper
anchoring rod
⑤
M4 screw holes (
⌀
4mm)
⑥
Button for holding a recording paper
⑦
Force sensor anchoring rod
⑧
Hole for a spring balance hook
⑨
Bracket for holding a spring balance
⑩
Velcro Tape
b
a
