Observe the given picture and answer the following questions. Where are these objects used?

Ball bearings are used between the machinery parts that undergo rotating motion. These mechanical members are used in the rotating parts such as shafts, wheels and other machine parts for reducing the sliding friction by converting into rolling friction.

Observe the given picture and answer the following questions. Do these objects help in increasing or decreasing friction? Explain how.

Ball bearings are used to prevent wear and tear out of machinery parts caused by friction. They convert the sliding friction into rolling friction. Rolling friction is always less than the sliding friction. Therefore, ball bearings help to reduce the friction between the machine parts. Friction is an opposing force that prevents the movements of objects and produces heat.

E M B I B E

Galaxy A Course in Science Book 8>Chapter 12 - Friction>Put on your thinking cap>Q 7

MEDIUM

8th CBSE

IMPORTANT

Earn 100

Observe the given picture and answer the following question.

Identify the object shown in the picture that is used to reduce friction.

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Important Questions on Friction

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 12 - Friction>Put on your thinking cap>Q 7

Observe the given picture and answer the following questions.

Question Image
Where are these objects used?

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 12 - Friction>Put on your thinking cap>Q 7

Observe the given picture and answer the following questions.

Question Image
Do these objects help in increasing or decreasing friction? Explain how.

HARD

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 12 - Friction>Extended learning>Q 1

Find out about different kinds of sports shoes used in various sports and the reason for the same.

HARD

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 12 - Friction>Extended learning>Q 2

Neha was pushing a heavy box along its length on the floor. Finding it difficult, she turned the box to place it vertically on its smaller surface. Would she need to apply less force now? Explain.

HARD

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 12 - Friction>Life Skill>Q 1

Rahul’s gardener uses a lawn mower for cutting the grass. However, the mower does not work properly. How can Rahul help his gardener?

HARD

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 12 - Friction>HOTS>Q 1

Why are the surfaces of matchbox made rough?

HARD

8th CBSE