pressure or density

Question 1

How do you measure volume accurately when using a measuring cylinder?

Answer 1

Read the volume at eye level and to the bottom of the meniscus

place measuring cylinder on a level surface

Question 2

How can the volume of an irregular object be found using a measuring cylinder?

Answer 2

1. Half fill measuring cylinder with water and read initial volume at eye level and bottom of the meniscus
2. lower object into measuring cylinder- make sure that it is fully submerged and water level has not risen above the scale
3. read final volume at eye level and bottom of the meniscus
4. Volume of object = final volume - initial volume

Question 3

How could you find the density of a paperclip accurately?

Answer 3

1. measure the mass of 50 paperclips on a balance
2. half fill a measuring cylinder with water and record initial volume
3. carefully add 50 paperclips and record final volume.
4. calculate the volume by taking the difference
5. Find density = mass / volume

Question 4

How do you find the density from a mass vs volume graph?

Answer 4

calculate the gradient

gradient = rise/run = mass/volume

Question 5

Explain what design feature makes a knife able to cut easily.

Answer 5

A sharp knife with a small surface area creates a greater pressure for the same force.

pressure = force/area

The knife will cut more easily

Question 6

Camels have adapted to walk effortlessly in the desert sand. Explain

Answer 6

Camels feet have a large surface area

P = F/A

A larger surface area for the same force results in lower pressure

The camel will not sink as much in the sand and can walk more easily.

Question 7

what is the formula for pressure difference

Answer 7

height (m) x density(g/cm3) x g (n)

Question 8

24 Kg in newtons

Answer 8

240N

Question 9

why use a bar graph

Answer 9

its discontinuous

Question 10

energy gpe changes question

Answer 10

first one decrease
second one increase
3 and 4 stay the same

Question 11

liquid boils and evaporate particles

Answer 11

bonds become weaker
particles move faster and gain ke
they begin to move freely

Question 12

how to find density of an irregular object

Answer 12

measure mass using mass balance
Fill the eureka can with water just below the sport then place the measuring cylinder beneath the spout to measure the volume submerge the substance in the water catching the displaced water in measuring cylinder

Question 13

pressure and temp formula

Answer 13

P / t1 = p / t2

Question 14

Liquids particles

Answer 14

weaker forces of attraction between particles. The particles are close together but can ,one past one another and form irregular arrgemnts. Have more energy than spills and they move in random directions at low speeds.

Question 15

Solids particles

Answer 15

strong forces of attraction hold particles toger in a fixed regular arrgment. Vibrate in fixed position