Friction Test -...

Which of the following is the cause of friction between two surfaces?

Rahul was trying to move a heavy block. He applied force but could not move the block. He then called Rohan, but both of them could not move the block. What conclusion can you draw from this?

A boy rolls a rubber ball on the wooden floor. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may

On a rainy day, Rahul wishes to go to the market. He is least likely to slip on the road with

Identify the wrong statement.

Which of the following relations is/are correct?

A book is placed on a table. What type of friction is acting on it?

Read the following statements and select the correct option.

Statement A: Shapes of the cars are streamlined.
Statement B: Streamlined shape reduces the viscous drag.

Pick up the correct statement.

Two identical steel balls are dropped in two beakers A and B. Beaker A is filled with water and Beaker B is filled with honey. Then,

Soap solutions are used in high speed cutting and grinding because

Brakes of automobiles do not work well during rainy season because

In which of the following situations friction is advantageous?

A. Writing on the black board
B. Riding on the vehicle
C. Brushing the teeth
D. Sliding a box on the inclined plane

Pick up the correct statements.

A. Sprinkling of powder on carom board, fills up the irregularities in the board surface. Hence, it reduces the friction.
B. Saliva in our mouth helps us to swallow the food.
C. Flat tyres increase the grip in the roads.

Which of the following instruments is used to measure force of friction?

Directions: Read the given data and answer the following question.

Make an inclined plane on a smooth floor and put a mark with pen at any point A on the inclined plane. Let a pencil cell move down from this point and note down the distance. Now, spread a piece of woolen cloth on the plane and repeat the experiment noting the distance. Repeat this activity by spreading sand paper over it.

In which case does the pencil cell covers maximum distance?

Directions: Read the given data and answer the following question.

Make an inclined plane on a smooth floor and put a mark with pen at any point A on the inclined plane. Let a pencil cell move down from this point and note down the distance. Now, spread a piece of woolen cloth on the plane and repeat the experiment noting the distance. Repeat this activity by spreading sand paper over it.

In which case does the pencil cell covers minimum distance?

Why are brake pads used in the brake system of bicycles and automobiles?

It is difficult to drag a bucket full of water than an empty bucket because

A bicycle is in motion. The force of friction exerted by the ground on its wheel is such that it acts