Measurement of Gravity (g)

Apparatus

Millisecond timer, metal ball, trapdoor and electromagnet.

Procedure

• Set up the apparatus. The millisecond timer starts when the ball is released and stops when the ball hits the trapdoor.

• Measure the height h as shown, using a metre stick.

• Release the ball and record the time t from the millisecond timer.

• Repeat three times for this height h and take the smallest time as the correct value for t.

• Repeat for different values of h.

• Remove one 0.1 N disc from the slotted weight, store this on the vehicle, and repeat.

• Calculate the values for g using the equation $h = \frac{1}{2} gt^2$. Obtain an average value for g.

• Alternatively draw a graph of h against $t^2$ and use the slope to find the value of g.

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Measurement of Gravity (g)

Results

Mass of vehicle 1, $m_1$ = .......... Kg. Mass of vehicle 1, $m_2$ = .......... Kg.

h/m	$t_1$/s	$t_2$/s	$t_3$/s	$t$/s	g/m s$^{-2}$
12
11