CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 1

EASY

JEE Main

IMPORTANT

Earn 100

For most of the surfaces used in daily life, the friction coefficient is less than $1$ . Is it always necessary that the friction coefficient should be less than $1$ ?

Important Questions on Friction

MEDIUM

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 2

Why is it easier to push a heavy block from behind than to press it on the top and push?

EASY

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 3

What is the average frictional force when a person has a usual

1 km

walk?

EASY

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 4

Why is it difficult to walk on a solid ice?

EASY

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 5

Can you accelerate a car on a frictionless horizontal road by putting more petrol in the engine? Can you stop a car going on a frictionless horizontal road by applying brakes?

MEDIUM

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 6

The spring fitted doors close by themselves when released. You want to keep the door open for a long time, say for an hour. If you put a

\frac{1}{2}

kg

stone in front of the open door, it does not help. The stone slides with the door and the door gets closed. However, if you sandwich a

20 g

piece of wood in the small gap between the door and the floor, the door stays open. Explain why, a much lighter piece of wood is able to keep the door open, while a heavy stone fails.

HARD

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 7

A classroom demonstration of Newton's first law is as follows: A glass is covered with a plastic card and a coin is placed on the card. The card is given a quick strike and the coin falls in the glass.

(a) Should the friction coefficient between the card and the coin be small or large?

(b) Should the coin be light or heavy?

(c) Why does the experiment fail if the card is gently pushed?

HARD

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 8

Can a tug of war be ever won on a frictionless surface?

HARD

JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 6 - Friction>QUESTIONS FOR SHORT ANSWER>Q 9