Why does changing a clay ball into a clay boat allows it to float?
Because the average density reduces due to the volume of air in the boat
Which is less dense? Salt water or fresh water?
Fresh water
The more tightly packed the particles within a substance are, the more _________ it is
Dense
If we place an empty plastic bottle in water, it will float. How can we make the bottle sink in water?
By increasing the mass of the bottle by filling it with water or by filling it with denser objects like coins or pebbles
If an object is neutrally buoyant in a liquid (i.e upthrust = weight), will it sink or float?
It will neither float nor sink. It will float just below the surface of the liquid.
True or False: If two objects have the same size or colour, they will both float
False. Flotation depends on the mass of the object and density of the fluid
What 2 measurements do you need to find the density of a brick?
mass and volume
What could you say about the density of a ball that is in a container with 3 liquids of different densities where the ball floats in the 2nd layer?
density of ball is equal to 2nd layer
What is the formula for finding the density of an object?
d=m/v
What is the density of an object if the mass is 40 g and the volume is 20 mL?
2 g/mL
How are the particles in a solid packed compared to particles in a liquid?
more tightly packed
Why do helium balloons rise?
helium is less dense than air around it
