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Write two disadvantages of fluid friction.
The disadvantages of fluid friction are:
1. Fluid friction reduces the speed of objects moving through the fluids by opposing their motion.
2. When objects move through fluids (air or water), they lose some of their energy in over coming the fluid friction. This decreases their efficiency.
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be :
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
You spill a bucket of soapy water on a marble floor accidently. Would it make easier or more difficult for you to walk on the floor? Why?
Explain why sportsmen use shoes with spikes.
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Explain why sliding friction is less than static friction.
Give examples to show that friction is both a friend and a foe.
Explain why objects moving in fluids must have special shapes.
What is force of friction?
What is the cause of friction between two surfaces?
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