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Subjects
Science State Board
Class 8
Force and presssure
Force, pressure, friction and surface tension
12.
Friction and pressure- In general
Exercise condition:
6
m.
Choose the best answer:
1
.
A physical quantity is dependent on the area on which it is applied and it's magnitude of perpendicular force. Find that physical quantity.
Pressure
Force
Viscosity
2
.
1.01
×
10
5
pascals is equal to
1 Newton
1 atmospheric pressure (1atm)
1 pascal
3
.
Choose some of the disadvantages of friction?
It is helpful in holding a object tightly
Fire sparkling between metal parts of the machines
Lifting cars in car sheds
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