Point 22 of 30 — Chapter 1: Physical MeasurementQuestion bank: 0 questions (0 with pictures)
22 5.5 Rules to remember ("Pay attention")
You can add or subtract only quantities of the same kind — those having the same dimensional formula. You cannot add a mass (kg) to a distance (m).
If they are of the same kind but in different units, convert one first: 1 m + 170 cm = 100 cm + 170 cm = 270 cm.
Quantities with different dimensional formulas can be multiplied or divided, and a new quantity results (distance ÷ time → speed; force × distance → work).
Pure numbers, fractions and constants like ½, 2, π, are dimensionless.
📝 Question bank for this point
0 questions linked to this point only, 0 of them with pictures.
