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
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.
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