A solid block shows a reading of 15kgf on a spring balance that is calibrated in kilogram-force on the Earth.
(i) Convert 15kgf to newton.
(ii) Determine the mass of the block in kilogram.
(iii) The block is taken to planet Z, where the value of g is 7.35m/s2. Calculate its weight there in newton.
(iv) The same spring balance, still calibrated on Earth values, is used on planet Z. What reading (in kgf) will it show for the block?
(v) Explain why a spring balance calibrated on the Earth may give misleading mass values when used on another planet.