Determination of g by a free-fall method

Question 1

how is g calculated

Answer 1

time taken for a free falling object to move through a measured distance

Question 2

what is the problem when calculating g

Answer 2

relatively short times involved

Question 3

how is the experiment done

Answer 3

• time measured on stop clock to 1/100th of a second
• the swtich is open and the electromagnet is activated, holding the ball in place
• when the switch is thrown, the electromagnet circuit is broken, releasing the ball, and simultaneously the clock circuit is activated, starting the clock
• the clock is stopped when the ball hits the trap door and breaks the circuit
• repeated three times, over a wide range of heights as possibke

Question 4

precautions

Answer 4

• although low volatages are being used, care should be taken with wiring to prevent any short circuits
• a suitable container should be placed under the trapdoor to catch the baller bearing and prevent it falling on the floor, creating a trip hazard