Qn: Will placing heavier plates on the table cloth increase or decrease the success rate of the experiment?
Heavier plates have a larger inertia hence it will be more reluctance to change its state of rest and will remain on its original position. Hence success rate will increase.
Egg experiment (start after 1 min)
Can you explain how this trick work to your partner?
When the support is removed suddenly, due to the inertia of the egg, they will remain at its rest position and not move together with the support.
QN: What happens to the passengers in a bus if the driver applies the brake suddenly? Explain your answer.
ANS: The passengers will be thrown forward. Their inertia resist a change in motion hence they will continue to move forward even though the bus has stopped.
As a result of gravitational force between the Earth and an object, when the object is dropped on earth, it will fall downwards towards the earth due to the gravitational attraction.
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.
Qn: The density blocks are made of different materials but they have the same volume. How do you determine which block has the largest density?
Ans: Density is mass/volume and their volume are the same, so the larger the mass, the larger the density. Measure the mass of the blocks, the block with the largest mass will have the largest density.
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 â€“ 110) / 50 = 48/50 = 0.96 g/cm 3 Â
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
When 2 liquids of different densities are poured into the same container, the denser one will sink and the less dense liquid will float.
When a solid is placed in a liquid, it will float if its density is lower than the liquidâ€™s density, and it will sink if it is denser than the liquid.
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
Qn: Why does normal coke sink in water while diet coke floats in water?
Ans: Diet coke contains less sugar than normal coke hence its density is less. Since it contains a lot of gas, its density will be smaller than that of water and will float.
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