Physics
Grade-9
Easy
Question
Force is being applied, and the object is moving. The frictional force will be _____.
- More than the force applied
- Less than the force applied
- Equal to the force applied
- Cannot say
Hint:
A fluid's viscosity is referred to as its "thickness."
The correct answer is: Less than the force applied
"Image of mercury in a thermometer" has higher fluid friction.
- The mercury in a thermometer moves over a solid surface.
- The thickness of mercury is more than that of water and the solid surface needs more friction than oil and petrol.
- The motion of mercury in a thermometer has higher fluid friction.
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