Special kinds of grooves are made in automobile tyres. This is done in order to
Increases friction.
Reduce Friction.
Increases the speed of rotation of the tyres.
for more style
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
If we apply a force to a body which is in contact with the surface of another body and if the body does not move, then the force of friction is
Static friction.
Limiting friction.
Dynamic friction.
Sliding friction.
In decreasing order of magnitude which of the following is CORRECT?
rolling, static, sliding friction.
static, sliding, rolling.
static, rolling, sliding.
sliding, static, rolling.
When a body is sliding over other body with a constant speed, the force of friction acting on it is
Rolling friction.
Which of the following statements is correct about frictional force?
It exists only for moving bodies.
It exists only for bodies which are at rest
It exists for both moving and non-moving bodies
None of these
When the applied force is doubled, then friction becomes
Doubled
Halved
Quadrupled
Zero
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.
The force required to keep an object moving with the same speed is a measure of
static friction.
sliding friction.
rolling friction.
limiting friction.
How does the proper inflation of tyre save fuel?
Normal reaction decreases
Normal reaction increases
Sliding contact with the road decreases
Sliding contact with the road increases