Unit 2 - Forces 2 (pressure)

Question 1

the average force on a certain area – pressure is measured in newtons per metre squared (N/m2) or pascals (Pa) and can be calculated using: pressure (N/m2) = force (N) / area (m2)

Answer 1

pressure

Question 2

a measure of length x width where the units are squared e.g. m2, mm2

Answer 2

area

Question 3

a mathematical relationship between different variables e.g. density (kg/m3) = mass (kg) / volume (m3)

Answer 3

formula

Question 4

a standard unit of pressure – 1 Pa = 1 N/m2

Answer 4

pascal (Pa)

Question 5

the distance below the surface of a liquid

Answer 5

depth

Question 6

lowering of pressure to below normal atmospheric pressure

Answer 6

decompression

Question 7

the mass of a material per unit volume - density (kg/m3) = mass (kg) / volume (m3)

Answer 7

density

Question 8

the upward force on an object in a liquid – measured in newtons (N)

Answer 8

buoyancy

Question 9

the upward force exerted on an object in water – measured in newtons (N)

Answer 9

upthrust

Question 10

when an object is put into water a volume of water equal in size to the volume of that object is displaced (if the object doesn’t soak up water).

Answer 10

displaced

Question 11

the pressure exerted by the atmosphere which is due to the weight of air above pushing down on everything below.

Answer 11

atmospheric pressure

Question 12

where warm and cold masses of air collide

Answer 12

weather front

Question 13

height above sea level

Answer 13

altitude

Question 14

kept at a known pressure e.g. in an air cabin

Answer 14

pressurised

Question 15

an instrument used to measure pressure

Answer 15

barometer

Question 16

an instrument used to measure the altitude (height) of an object above a fixed level

Answer 16

altimeter

Question 17

it controls the passage of something e.g. an air valve or a water valve.

Answer 17

valve