Iwant to design a laboratory experiment to determine the coefficient of static friction between an object and a surface, and prove that the coefficient of static friction is dependent only on the surfaces in contact and is not affected by any change in the mass of the object.
-what procedure should i carry out?
-what would be any safety precautions that i could take?
- what would be any limitations to the experiment ( if any)?

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

a is the best answer your welcome