Answer the following question:

A. Why is sliding friction less than static friction for the same surface?

B. A book of mass 1 kg is at rest on the table. Maximum value of static friction is 5N and sliding friction is 4N.
Now, Answer:

i. If we apply a force of 4.5N will the body move from rest?
ii. If we apply a force of 6N will the body move from rest?
[5 MARKS]

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Solution

Part A : 2 Marks
Part B : 3 Marks

A. Sliding friction is always less than static friction because two sliding objects find less time to get interlocked against each other’s irregularities of surfaces as a result of which they experience less friction.

B.
i) No, minimum force required to move the body from rest is 5N
ii) Yes, Force is greater than 5N, so it will start moving.

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Question 8
Answer the following questions:
A. Why is sliding friction less than static friction between the same surfaces?
B. A book of mass 1 kg is kept at rest on a table. The maximum value of static friction is 200 N and sliding friction is 180 N.
i. If we apply a force of 190 N, will the body move?
ii. If we apply a force of 210 N, will the body move?

Q. Question 08
Answer the following question:

A. Why is sliding friction less than static friction for the same surface?

B. A book of mass 1 kg is at rest on the table. Maximum value of static friction is 200 N and sliding friction is 180 N.
Now, Answer:

i. If we apply a force of 190 N will the body move from rest?
ii. If we apply a force of 210 N will the body move from rest?
iii. What is the acceleration of the book if I apply 220 N of force? [5 MARKS]

Q. A book is lying on the horizontal table top. If we tilt the table a little, then the book starts sliding down slowly. This happens because:
(a) sliding friction is greater than static friction
(b) sliding friction is less than force of gravity
(c) static friction is greater than sliding friction
(d) force of gravity is less than sliding friction

Q. A wooden block kept on concrete was initially at rest. When a force of 20 N acts on it, the block starts to move in the direction of force. Which of the following is correct for the friction on the block when it is moving?

Q. A force of 5N is required to move an object from rest. The value of static friction is:

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