PS.7.1.2: Use models to illustrate the effects of balanced and unbalanced…

Forces and Motion: Crash, Push and Stop Grade 8 · partly supports this outcome

Why you lurch forward when the bus brakes, how fast a toy car really goes, why heavier carts hit harder, and how to build a crumple zone that saves an egg. Four lessons on inertia, speed, mass and stopping safely.

• Why do you lurch forward when a bus stops? 50–60 min

  Students flick a card out from under a coin, then crash toy cars carrying loose clay passengers into a barrier and measure how far the passenger flies. They use their data to explain inertia and to design a better seatbelt.

• Why does a heavier cart hit harder? 50–60 min

  Teams load a toy car with coins, roll it down the same ramp into a paper cup and measure how far the cup slides. They graph mass against slide distance and explain, with momentum, why a loaded truck is harder to stop than a small car.

Printable practice for PS.7.1.2

• Forces and Motion: Crash, Push and Stop workbook included with the unit

  3 practice pages, 3 readings, 2 English-support pages, 1 word wall, 1 unit review, 1 unit test, with answer keys.

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