c) acceleration of free fall

• state the value and unit of the acceleration of free fall (g)

• 9.81ms^-2

• state how the acceleration of free fall is determined using an electromagnet and a trap door

• an electromagnet holds a small steel ball over a trap door next to a metre rule

• the current in the circuit is switched off

  • the timer starts

  • the electromagnet demagnetises

  • the ball falls

• the ball hits the trap door

  • the electrical contact is broken

  • the timer stops

• s = ut + 1/2at^2

• state how the acceleration of free fall is determined using a light gates and a timer

• two light gates are connected to a timer, one above the metre rule and one below

• the ball is dropped

  • as it falls through the first light gate, the timer starts

  • as it falls through the second light gate, the timer stops

• s = ut + 1/2at^2

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