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answer 5)(a)The pressure exerted on a surface by an object increases as the weight of the object increases or the surface area of contact decreases. ... As such, pressure depends on the amount of gas (in number of molecules), its temperature, and the volume of the container.
(b)si unt of force is Newton
si unit of pressure is pascal
answer 6(a) gravitational force
(b) frictional force
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