A powerpoint for teaching basic concepts of Mass, Weight and Density.

1. Mass, Weight and Density Sec 3 Science Physics

22. Density Qn: Do you think the gold bars, gold chain and gold coin have the same density? Ans: Yes, the density of a substance is a constant that does not depend on its shape or volume.

25. Density Qn: All the rods on the right have the same mass. Which rod has the smallest density? Ans: The longest rod has the smallest density. Density = mass / volume, since mass is constant, density will be inversely proportional to density. Hence, the smallest density rod will have the largest volume (longest rod).

26. Density Qn : The density of Olive oil is 0.92 g/cm 3 . What is the volume of 500 g of Olive oil? Ans: Volume = mass / density = 500 / 0.92 = 544 cm 3 Qn: The mass of an empty beaker is 110 g. The total mass of the beaker is 158 g when 50 cm 3 of a liquid is poured into it. What is the density of the liquid? Ans: Density = mass / volume = (158 – 110) / 50 = 48/50 = 0.96 g/cm 3

27. Density Qn : A room is 4 m long, 2.5 m wide and 2 m high. If the density of air in the room is 1.3 kg/m 3 , what is the mass of air in the room? Ans: Mass = density x volume = 1.3 x (4 x 2.5 x 2) = 26 kg

29. Density Qn: Why is the woman able to float in the dead sea effortlessly? Ans: The density of dead sea is very high (due to its high salt content) and human body is less dense than the dead sea hence she is able to float in the dead sea. Floating in dead sea