Density
This is the formula for calculating density.
What is density = mass / volume?
This is the formula for calculating a moment.
What is moment = force X distance?
This is the formula for calculating pressure in solids.
What is pressure = force / area?
This is why dams are built to be stronger at the bottom then the top.
What is pressure increasing directly proportional to depth?
This is the energy of motion.
What is kinetic energy?
This is the formula for calculating weight.
What is weight = mass x gravity?
These are the 2 reactions that occur when forces are unbalanced.
What are change in speed or change in direction?
This is the difference between mass and weight.
What are mass is the amount of stuff, weight is a force; weight changes depending on the strength of gravity?
This is the direction of pressure in fluids.
What is every direction?
This is the total amount of vibrating, kinetic energy of particles.
What is heat?
This is how we measure the volume of irregular shapes that sink in water.
What is displacement?
We measure the length of a lever from this point where the turning force occurs.
What is a pivot?
These are the words that complete the following statement:
"Sharp objects apply _______ pressure, because they have _______ surface area."
What are high pressure and low surface area?
This is what happens to the pressure when your depth triples.
What is the pressure tripling?
This is why hot air balloons float in the atmosphere.
What is hot air is less dense then the atmosphere, because high energy particles take up more space?
This is the reason why objects float in water, and the reason why objects sink in water.
What are the objects are less dense than water, and the objects are more dense than water?
When the net force on a see-saw is zero, this is true about the moments.
What is the moments are equal or balanced?
This is what happens to the pressure when surface area increases and force remains constant.
What is the pressure decreases?
This is what happens when we increase the temperature of a fluid, without increasing the volume of the container, and a description using our particle model.
What is the pressure increases because the particles are moving faster when more energy is added; faster particles means more collisions, which means more pressure?
These are our rules for graphing.
What are:
You must use pencil. Label both axis. Data points must be “x”. Use a straight edge or ruler. The independent variable is the X-axis?
Calculate!
*no need to answer in the form of a question*
A box weighs 40 Newtons, and has a volume of 10 liters. Yet Qin says the box will float in water (density = 1kg/L). Prove she is correct or incorrect.
40N is the weight
mass = weight / gravity
mass = 40N / (10N/kg); mass = 4kg
density = mass / volume
density = 4kg / 10 liters; density = 0.4kg/L
floats! 0.4kg/L < 1kg/L
The is the moment created by a 5 kg mass acting on a 20 meter lever.
What is 1,000 Nm?
mass is not a force!
5kg X 10N/kg = 50N
M = 50N X 20m = 1,000 Nm
This is the pressure exerted by a box with a surface area of 100cm2 and a mass of 12kgs.
What is 1.2 N/cm2?
weight = mass X gravity = 12kg X 10N/kg = 120N
pressure = force/area = 120N / 100cm2 = 1.2N/cm2
This is how we use our particle model to describe a balloon being inflated.
What is:
More particles in a balloon =
More collisions against the wall =
More force, pushing the sides out =
More volume for the balloon?
These are 3 descriptions of each of the 3 phases of matter, as discussed in class.
What are:
Solid - rigid, fixed shape, fixed volume
Liquid - not rigid, no fixed shape, fixed volume
Gas - not rigid, no fixed shape, no fixed volume?