In this method you'll find all the information you need to carry out a successful practical, taking care of graphs,equipment, the method and safety precautions. This ensures that you can impress your teachers when it comes to practical examinations as you'll know what to look out for and how to set...
First, measure the diameter of the metal wire used with a vernier calliper
Do this several times along the wire and calculate the mean diameter (d)
Use equation (½ × d)2 × 𝜋 to calculate the cross-sectional area of the wire
Setting apparatus:
On a bench, clamp one end of the wire between 2 wooden blocks between a G- clamp
On the other side ensure the wire is taut over a pulley and connect to a mass hanger
Place metre rule on the bench below the wire with a tape to act as a marker to measure extension
Measure the initial length of the wire with the rule
Recording Measurements:
Mass (kg) Force (N) Extension (m)
0.1 0.981 0.02
1. On the mass hanger place a mass of 100g
2. Calculate the Force on the wire using equation Mass × Gravitational Field strength (9.81)
Measure the extension of the wire by measure the additional length past the marker
Record values in table
Continue adding 100g masses and recording extension until a total of 1kg has been added
Plot a graph of Force (y-axis) against extension (x-axis) and plot points form table
Draw line of best fit and calculate the gradient
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