Topic 5 - Density and Pressure

Question 1

what is the formula for density?

Answer 1

density = mass / volume

Question 2

what are the units for density?

Answer 2

g/cm³ or kg/m³

Question 3

how do you convert from g/cm³ to kg/m³?

Answer 3

1 g/cm³ = 1000kg/m³

Question 4

what factors do not affect density?

Answer 4

size or shape

Question 5

what does average density determine?

Answer 5

if an object will float

Question 6

how would you find the density of a box-shaped object?

Answer 6

1. use a balance to measure the mass
2. measure the length, width and height. calculate volume by multiplying them
3. use the formula (density = mass / volume) to calculate density

Question 7

how would you find the density of a irregular-shaped object?

Answer 7

1. use a balance to measure the mass
2. submerge the object in a eureka can filled with water. the displaced water will be transferred to a measuring cylinder
3. record the volume of water in the measuring cylinder
4. use the formula (density = mass / volume) to calculate density

Question 8

what is the formula for pressure?

Answer 8

pressure = force / area

Question 9

where does pressure at any point act in gases and liquids at rest?

Answer 9

equally in all directions

Question 10

what does pressure increase with in gases and liquids?

Answer 10

depth

Question 11

what is the formula for pressure difference?

Answer 11

pressure difference = height x density x gravitational field strength

Question 12

what is pressure measured in?

Answer 12

pascals (Pa) or kilopascals (kPa)

Question 13

what is one pascal equivient to?

Answer 13

1 N/m²