Question

Pinky Public School
Name:manoj kumar.r
Grade: VIII, Sec:c
Physical Science - Worksheet-2
Lesson 12. Friction
1. Why liquids and gases are called as fluid?
2. Fill in the blanks: A car with worn out treads on tyres is more likely to skid
due to
3. Choose the correct option: Friction, that exists between two surfaces in
contact, when there is no relative motion between them, is called
a) Static friction
b) Rolling friction
c) Sliding friction
d) None of these
4. State True or False: Sliding friction is greater than static friction.
a) true
b) false
5. State True or False: We can easily walk on frictionless surface.
a) true
b) false
6. Choose the correct option: Interlocking of irregularities on two surface in
contact cause
a) Temperature b) Friction
c) Pressured) Motion
7. Fill in the blanks: Sprinkling of powder on carom board
friction
8. State True or False: Friction opposes relative motion between the surfaces
of the book and the table.
a) true
b) false
9. Least amount of friction is required in which of the following sports?
a) Cricket b) Football
c) Hockey d) Ice skating
10. State True or False: The brakes slow down or stop moving bicycle due to
friction.
a) true
b) false
11. What is streamlined?
12. State True or False: It is easier to push than pull.
a) true
b) false
13. Which of the following surface will offer the least frictional force?
a) Dry marble floor
b) Wet marble floor
c) Sand floor
d) Grass floor
14. Which surface has the least amount of friction?
a) ice
b) grass
c) sand d) None of these
15. State True or False: Smooth surface has more irregularities than rough
surface.
a) true
b) false​

Answer 1

1st answer because molecules are very far in liquid s and gases