Is it possible to determine the magnitude of the frictional force from the reading of the spring balance?

Important Questions on Physical Environment

EASY

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 1 - Physical Environment>Exercise 2>Q 1

When an object remains stationary on a particular surface, do the maximum magnitude of static friction of the object with the surface always remain constant?

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 1 - Physical Environment>Exercise 2>Q 2

Does the maximum magnitude of static frictional force depend on how an object is kept on a surface?

EASY

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 1 - Physical Environment>Exercise 3>Q 1

Question Image
In which case (picture 1 or 2) do you think, magnitude of the pulling force should be more to make the box move? In which picture is the magnitude of the static frictional force greater?

EASY

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 1 - Physical Environment>Exercise 3>Q 2

Question Image
Comparing pictures 2 and 3 where do we find the magnitude of the static frictional force to be greater? In which case does it require more force to move the box?

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 1 - Physical Environment>Exercise 4>Q 1

A

2

litre bottle is filled up completely with a liquid. The mass of the bottle is

4 kg

when it is hung from the spring balance. If the bottle have negligible mass, what is the density of the liquid filled into the bottle? ( in gram per cc)

MEDIUM

8th West Bengal Board

IMPORTANT

Environment and Science Class 8>Chapter 1 - Physical Environment>Exercise 4>Q 2

Find the mass (in grams) of