Advantages and disadvantages of friction - class-IX
Description: advantages and disadvantages of friction | |
Number of Questions: 35 | |
Created by: Vaibhav Pathak | |
Tags: force and pressure force force and motion physics friction |
Why do we sprinkle powder before playing caroms?
Powder is a lubricant
To keep machines running smoothly and to avoid wear and tear of machines, the best and the most commonly used lubricant is:
A car will skid more on a wet road than on a dry one because, between the dry road and the car tyres there is more:
Any substance which is used to reduce the roughness of a surface is called a:
Friction can be increased by increasing:
The force which prevents us from slipping while walking on the road is:
In which of the following cases more friction is desirable?
Spikes are provided in the shoes of athlete
The surface of the head of a matchstick and sides of a match box are deliberately made rough to
Friction reduces efficiency of machines due to:
_______ is responsible for wear and tear of machine parts.
You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off?
heat is produced whenever work is done against friction
_______ helps in writing with a pen or pencil on a paper.
Which of the following is true for friction?
State whether the given statement is true or false :
Friction is _____ in some situations.
In what ways is friction harmful?
The friction between two bodies produces
In absence of friction
State whether the given statement is true or false :
Which of the following is not a type of friction?
Which of the below statements prove that friction is disadvantageous?
Which of the following statements is NOT true?
Frictional force is important for motor racing. This is because frictional force.
Friction is a that opposite motion?
Statement I: If friction is not present In nature. then life will be easy.
Statement II: Without friction. there would be no reaction from ground.
Which of the following statements is NOT true for friction force?
You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off ?
Friction is a/an
Friction should always be avoid.
The efficiency of machine is reduced due to friction.
A sphere $S$ roll without slipping, moving with a constant speed on a plank $P.$ The fraction between the upper surface of $P$ and the sphere is sufficient to prevent slipping, while the lower surface of $P$ is smooth and rests on the ground. Initially, $P$ is fixed to the ground by a pin $N.$ If $N$ is suddenly removed: