Question

1. (a) a student wants to investigate the principle of moments. he connects a ruler to a stand with a pivot and hangs a 2 n weight from the 60 cm mark on the ruler. he uses a newtonmeter to hold the ruler horizontal. the scale on the newtonmeter reads from 0 n to 10 n. describe how the student could check that the ruler is horizontal.

Explanation:

Use a spirit - level placed on the ruler. If the bubble in the spirit - level is centered, the ruler is horizontal. Another way is to visually compare the height of the two ends of the ruler against a vertical reference (like the stand) and adjust until they appear at the same height.

Answer:

Use a spirit - level and check if the bubble is centered; or visually compare the height of the two ends of the ruler against a vertical reference.