Wheel and axle help to move objects with a very little force. This is because
Rolling friction > Sliding friction.
Sliding friction > Rolling friction.
Rolling friction = Sliding friction.
Rolling friction + Sliding friction = 0
Which of the following describe a frictional force?
I. Frictional force always opposes the motion of an object
II. Frictional force is parallel to the surface in contact.
III. Frictional force always produces heat.
IV. Frictional force can be increased or reduced.
I and II only
III and IV only
I, II and III only
I, II and IV only
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
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 soles of our shoes have grooves. This is to
Increase the friction between shoes and the ground.
Make the shoes look more attractive.
Reduce the friction between the shoes and the ground.
Save on rubber used to make the soles.
A person is moving on a rough horizontal surface towards east. The direction of friction force is towards
West
East
North
South
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
The force required to keep an object moving with the same speed is a measure of
static friction.
sliding friction.
rolling friction.
limiting friction.
Friction is force. How is friction caused?
One surface moving.
Two surfaces being pushed together.
Two surfaces being rubbed together.
Two surface being pulled apart.
The maximum static force of friction experienced when one body just slides upon another body is called
Static friction.
Limiting friction.
Dynamic friction.
Sliding friction.
