Increasing and reducing friction - class-VIII
Description: increasing and reducing friction | |
Number of Questions: 22 | |
Created by: Muni Gupte | |
Tags: physics friction force force and motion force and pressure |
The surface of the head of a match stick and sides of a match box are deliberately made rough to:
Correct air pressure in our vehicle tyres help to reduce:
Wheels reduce friction due to:
With increase of temperature, the frictional force acting between two surfaces increases.
Friction is minimised by using
powder sprinkled on a carrom board
The force of friction on a static body ________ , if It is on a rough surface then.
Powder is used in carrom board for
Friction depends upon ................. of surfaces.
Graphite powder is used in machines to _________.
Can friction ever be eliminated?
The substance that helps to ______ friction are called lubricants.
Why are the tyres of automobiles grooved?
Kabaddi players rub their hands with soil so that they can :
Which of the following are done to reduce friction?
a) Making grooves in the shoes
b) Polishing rough surfaces
c) Using wheels, ball bearings
d) Creating an air cushion
How do brake pads help in stopping an automobile?
Which of the following are done to increase friction?
The steps for decreasing friction includes:
If we apply oil on door hinges, the friction will:
In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is:
Which of the following is used to reduce friction :
1. Streamlines
2. Use of ball bearings
3. Lubrication
Why are efforts made to reduce friction?