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WorksheetsFriction - A Necessary Evil
Total questions: 10
Worksheet time: 5mins
properties of friction are
it is a contact force
it acts in a direction opposite to the motion of the moving object
it opposes motion of an object
all of these
why it is diffcult to walk on the wet floor then a dry floor
because of contact force
because of more friction
because of gravitation
because of less friction
Which of the following is true?
Static friction > Sliding friction > Rolling friction
Static friction < Sliding friction > Rolling friction
Static friction < Sliding friction < Rolling friction
Static friction = Sliding friction = Rolling friction
Give examples of increasing the friction-
Adding lubricant to machines
Adding grooves on tires
Adding oil between the door joints
Adding powder on carrom board
Give examples of decreasing friction-
Adding spikes to shoes
putting ball bearings in motors
applying coarse powder on hands
breaking a polished surface
Whenever the surfaces In contact tend to move or move with respect to each other, the force of friction comes into play,
Only if the objects are solid.
Only if one of the two objects is liquid
Only if one of the two objects is gaseous
Irrespective of whether the objects are solid, liquid or gaseous
If we apply oil on door hinges, the friction will:
Increase
Decrease
Disappear Altogether
Will remain unchanged
Which Of The Following Statement Is Or Are Incorrect?
Friction can never be entirely eliminated
Dolphins are streamlined body by nature to reduce friction with water
The use of ball bearing makes the wheel roll smoothly over the axle
None of the above
Which Of The Following Statements Is Incorrect?
Friction acts on a ball rolling along the ground.
Friction acts on a boat moving on water
Friction acts on a bicycle moving on a smooth road.
Friction does not act on a ball moving through air.
What kind of friction slows down the movement of the swimmer?
Drag
Static
Sliding
Rolling
