The surface of the head of a match stick and sides of a match box are deliberately made rough to
Increase friction.
Decrease friction.
Increase amount of heat.
Decrease amount of heat.
The minimum force required to make one body just slide over another body is called
Static friction.
Rolling friction.
Sliding friction.
Limiting friction.
In which of the following cases more friction is desirable?
Movement of piston in a cylinder.
Braking of a vehicle.
Running on a track.
All of the above.
It is difficult to move a cycle with brakes on because
Rolling friction opposes motion on road
Sliding friction opposes motion on road
Rolling friction is more than sliding friction
Sliding friction is more than rolling friction
The surface of a table is smoother as compared to that of a road. This is due to
irregularities on the surface of road.
polishing of the table.
a road surface may have more dust as compared to a table.
all of the above.
With increase in weight of a body the limiting friction
Increases.
Decreases.
Does not change.
First increases and then decreases.
Which of the following statement is TRUE?
Static friction is more than dynamic friction.
Static friction is less than dynamic friction.
Static friction is equal to dynamic friction.
There is no relationship between static and dynamic friction.
When the applied force is doubled, then friction becomes
Doubled
Halved
Quadrupled
Zero
For two surfaces, which of the following has highest magnitude?
Dynamic friction.
A streamlined body
Increases friction.
Reduces friction.
Decreases weight.
Increases weight.
