Sink or Swim
What is one way to determine if an object will sink or float?
Determine if its mass is greater than its volume, determine whether it is solid or hollow, or consider its material
Historically, what was the purpose of catapults?
To knock down enemy walls from afar
How do you change from a liquid to a gas?
Add heat energy
What is density?
A combination of an item's volume and mass
Which common household item has a super-absorbent gel that can be used to change the density of water?
Diapers
Why does an empty water bottle float when a full water bottle sinks?
The empty water bottle has less mass than the full water bottle
Which time period were catapults most often used?
The medieval period
How do you change from a liquid to a solid?
Remove heat energy
What is the volume of an object?
The amount of space an object takes up
Why is "oobleck" interesting to work with when learning about states of matter?
It sometimes acts as a solid and sometimes acts as a liquid
What must you do in order to float more mass?
Increase the volume
How do catapults get the power necessary to hurl rocks?
Elastic energy from rope
Identify a solid, liquid, and gas in a can of soda pop.
Solid can, liquid pop, carbon dioxide gas
Identify 2 constants in our Sink or Swim experiments.
The size of the cup, the amount of liquid in the cup, the items tested
Which author first introduced the idea of "oobleck" in his book "Bartholomew and the Oobleck".
Dr. Seuss
What happens when you mix oil and water? Why does this happen?
The liquids will separate into layers with the oil on top because the oil is less dense than the water
What is one benefit of using a catapult during times of war?
Provides distance between you and enemy fire so you don't get hit, more power to break down large barriers
Identify 2 differences between a liquid and a solid.
A liquid takes the shape of its container and is able to flow- a solid does not.
What is the dependent variable in the experiment in which we tested to see which items were able to float in water?
The ability of the items to float
Which of the following three items has elasticity: a rubber band, a t-shirt, or a desk?
All of the above- everything has some level of elasticity
How can heavy metal ships float with literal tons of cargo?
They have hollowed-out bottoms with ribbing to increase the volume and provide structure
What is one way to modify a catapult to increase distance or power?
Adding additional elastic energy, lowering the brace-bar
Describe the movement and spacing of particles in a gas.
Gas particles are fast-moving and spread far apart from each other
What is the independent variable in the experiment in which we tested the ability of items to sink or float in water, maple syrup, and vegetable oil?
The type of liquid used
What happens to most items when they are placed in maple syrup? Why is that?
They float because most items we tested were less dense than the syrup