CBSE Class 8 Science Worksheet - Friction Part B

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CBSE Class 8 Science Worksheet - Friction Part B - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.

BHARATI PUBLIC SCHOOL

SIR GANGARAM HOSPITAL MARG

SUMMATIVE ASSESSMENT No.1

GENERAL SCIENCE

CLASS-8

Assignment no. 8

Ch- 12 Friction

Q1 Fill in the blanks:

i) Force acting on a body can be measured by a -----------------.

ii) Friction is caused by the -------- on the two surfaces in contact

iii) Frictional force exerted by fluids is also called -------------

iv) The frictional force on an object in a fluid depends on its -------,----------- and----------------.

v) ---------------- can be used to reduce friction

vi) ---------is also produced with friction.

vii) Shape of the objects moving in the fluid is ------ to overcome friction exerted by liquids.

viii)------- are used in the machines to protect their surfaces from wear due to friction.

ix)Soapy floor is slippery due to -------- friction.

x)Ball bearing are used to convert static friction into ----- friction.

Q2 Why is it difficult to walk on a smooth and wet floor?

Q3 Why front portion of an aeroplane has a spherical shape or is streamlined?

Q4 On what principle do ball bearings work?

Q5 Give constrction and working of a spring balance. Draw the diagram also.

Q6 “ force of friction is much greater on a rough surface”

Q7 Give some advantages of friction.

Q8 Writ e two advantages of rolling friction.

Q9 Mention two ways to reduce friction?

Q10 differentiate between static and sliding friction.

Q 11 a) Two objects, A and B, one over the other, are moving with the same velocity.

Which of the following statements is correct?

A) Friction on A is in the forward direction.

B) Friction on A is in the backward direction.

C) Friction on B is in the forward direction.

D) No friction acts between A and B.


Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 8 Science Worksheet - Friction Part B

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