Matter and Materials

Question 1

density=

Answer 1

mass/ volume

Question 2

pressure=

Answer 2

force / area

Question 3

Change in pressure liquid=

Answer 3

density x gravity x depth

Question 4

spring constant=

Answer 4

force/ extension

Question 5

strain=

Answer 5

extension / og length

Question 6

stress=

Answer 6

normal force/ cross section area

Question 7

stress

Answer 7

force at right angle to a surface per unit cross sect area

Question 8

strain

Answer 8

extension per unit length

Question 9

young modulus=

Answer 9

stress/ strain

Question 10

elastic potential energy=

Answer 10

Final force/2 x extension

Question 11

Archimedes’ principle

Answer 11

upthrust on a body = weight of the liquid/ gas it displaces

Question 12

upthrust =

Answer 12

density x volume x gravity

Question 13

pressure is a _____ quantity

Answer 13

scalar

Question 14

pressure acts in

Answer 14

all directions at right angles

Question 15

Young Modulus measured in

Answer 15

Giga Pascals

Question 16

gradient of stress-strain graph=
(force-extension)

Answer 16

Yong modu

Question 17

Elastic potential energy =

Answer 17

force/2 x extension
spring const/2 x extension squared
area under work-disance graph

Question 18

units to always use

Answer 18

METRES!!

Question 19

mm to m

Answer 19

divide by 1000

Question 20

always remember

Answer 20

Check units used in graphs and question

Question 21

when graph starts to bend

Answer 21

stops obeying hooke’s law
Surpassed limit of proportionality

Question 22

when force-extension graph starts bending

Answer 22

stops obeying hookes law
limit of proportionality reached

Question 23

gradient of force- extension graph

Answer 23

spring const

Question 24

tensile forces
compressive forces

Answer 24

produce extension
remove length