(1) Find your mass in kilogram from the relation, m = (weight in lb)/(2.25 lb/kg
ID: 2301227 • Letter: #
Question
(1) Find your mass in kilogram from the relation, m = (weight in lb)/(2.25 lb/kg) = or your weight in newton from the relation, w = (weight in lb)/(0.225 lb/N) = .
(2) Find the area you occupy standing upright by measuring the length (L) and width (W) of the rectangle you make on the floor with your feet clasped together, = (L x W) =
(3) Find the area you occupy lying on your back by measuring the length (L) and width (W) of the rectangle you make on the floor lying on your back, = (L x W) =
(4) Determine the pressure you exert on the floor standing upright from the relation, Psu = = =
(5) Determine the pressure you exert on the floor lying on my back from the relation, Plb = = =
Knowledge Construction Questions
(A) What can we say about the situation in which you exert more pressure on the ground and why? What kind of force produced pressure on the area?
(B) What conclusion can we make about how pressure relates to force and area?
Knowledge Construction Questions
(A) From your result in (1), what can we say about the hydrostatic pressure at the bottom of the block in both containers? Would the result be different if you were to put the block in a lake with the same level of water?
(B) What conclusion can we make about what hydrostatic pressure d
Explanation / Answer
My weight in lbs = 174
(1) Find your mass in kilogram from the relation, m = (weight in lb)/(2.25 lb/kg)=174/2.25=77.33 kg
or your weight in newton from the relation, w = (weight in lb)/(0.225 lb/N)=174/0.225=773.33N
(2) Find the area you occupy standing upright by measuring the length (L) and width (W) of the rectangle you make on the floor with your feet clasped together, = (L x W) = 0.5m*0.4m = 0.2 m^2
(3) Find the area you occupy lying on your back by measuring the length (L) and width (W) of the rectangle you make on the floor lying on your back, = (L x W) = 1.9m*0.4m = 0.76 m^2
(4) Determine the pressure you exert on the floor standing upright from the relation, Psu
=(weight in N)/(area)=773.33/0.2 = 3866.65 N/m^2 = 3866.65 Pa
(5) Determine the pressure you exert on the floor lying on my back from the relation, Plb
=(weight in N)/(area)=773.33/0.76 = 1017.54 N/m^2 = 1017.54 Pa
Knowledge Construction Questions
(A) What can we say about the situation in which you exert more pressure on the ground and why? What kind of force produced pressure on the area?
We exert more pressure when we are standing upright, because force of our weight is exerted over a small area, than when lying on our back
Gravitaional force on our body produces the pressure on the area
(B) What conclusion can we make about how pressure relates to force and area?
Pressure is inversely proportional to area, i.e. more area implies less pressure and vice versa
Pressure is directly proportional to force, i.e. more force implies more pressure and vice versa
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