Question

worksheet 80

1. using digital devices or any other relevant resources such as books magazines and newspapers, search how pressure is applied in the following:

a) car breaking system

b) foundation of buildings

c) walking on sand or snow

d) water pump

e) siphoning equipment

Explanation:

a) In a car - braking system, hydraulic pressure is used. When the brake pedal is pressed, it pushes brake fluid through a system of pipes to the brake calipers or wheel cylinders, which then apply pressure to the brake pads or shoes, creating friction to slow down or stop the car.
b) The foundation of buildings distributes the weight of the building over a large area to reduce the pressure on the ground. This is based on the principle that pressure is force per unit area. A larger area means less pressure on the soil, preventing the building from sinking.
c) When walking on sand or snow, the pressure exerted by our feet depends on the surface area of our feet in contact with the sand/snow. Wearing snowshoes increases the surface area, reducing the pressure and preventing us from sinking too deep.
d) In a water - pump, pressure differences are created. A centrifugal pump, for example, uses an impeller to increase the velocity of the water, which is then converted into pressure energy. Positive - displacement pumps move water by trapping a fixed amount and forcing it into a discharge pipe.
e) Siphoning equipment works based on pressure differences. A siphon creates a pressure difference between the higher - level liquid source and the lower - level destination. Once the siphon is primed, the liquid flows from the higher to the lower level due to the pressure difference and gravity.

Answer:

a) Hydraulic pressure is used to create friction for braking.
b) Pressure is distributed over a large area to prevent sinking.
c) Surface area affects the pressure exerted while walking.
d) Pressure differences are created to move water.
e) Pressure differences and gravity are used to transfer liquid.