Flashcards in Determination of g Deck (4)

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1

## Equipment

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○ Stand and clamp

○ Electromagnet

○ Steel ball bearing

○ Light gate

○ Stopwatch

2

## Method

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○ Set up the apparatus as

shown in the diagram.

○ The position of the lower

light gate should be adjusted

such that the height h is

0.500m, measured using the

metre ruler.

○ Turn on the electromagnet and attach the ball bearing. Reset the stopwatch to zero and switch off the electromagnet. Read and record the time t on the stopwatch.

○ Reduce h by 0.050m by moving the lower light gate upwards and repeat this, reducing h by 0.050m each time down to 0.250m.

○ Repeat the experiment twice more and find and record the mean t for each h.

3

## ● Graphs and calculations:

###
○ Plot a graph of 2h/t against t and draw a line of best fit. The

gradient will be g.

○ h=ut + 1/2 gt^2 - 2h/t = 2u + gt

○ The y intercept is 2u, where u is the speed of the ball bearing

when it reaches the top light gate (which we don’t need).

4