0625/23/M/J/17 7
The diagram shows a man holding a sack and barrow stationary. He applies a vertical force to
the handle.
The centre of mass and the weight of the sack and barrow are shown. The wheel acts as a pivot.
force
exerted
by man
centre of mass
of sack and barrow
20 cm
80 cm
15 cm 45 cm
weight of
sack and barrow
200N
What is the magnitude of the vertical force exerted by the man?

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

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