Electromagnet and trapdoor

• What device holds the steel ball above the trapdoor in the experiment?

  An electromagnet
• What happens when the electromagnet is switched off?

  The ball is released and falls
• What triggers the stop timer in the experiment?

  The ball breaking the light beam
• What are the steps to determine the acceleration of freefall in this experiment?

  1. Measure the height of fall using a ruler.
  2. Record the time of fall using the timer.
  3. Use the formula $g = \frac{2h}{t^2}$ to calculate the acceleration of free fall.
• What is the formula used to calculate the acceleration of free fall?

  $g = \frac{2h}{t^2}$
• In the formula $t = \sqrt{\frac{2h}{g}}$, what does $h$ represent?

  The height of fall
• In the formula $t = \sqrt{\frac{2h}{g}}$, what does $g$ represent?

  The acceleration due to gravity
• What initial values are used in the formula $t = \sqrt{\frac{2h}{g}}$?

  h = 0 m, t = 0 s
• If the height of fall is measured as 10 m, how would you calculate the acceleration of free fall using the time recorded?

  Use the formula $g = \frac{2h}{t^2}$