# CBSE Class 11 – Physics: Laws of Motion and Friction Assignment 1

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Question 1:

(i) A body of mass moves along the positive , it starts at velocity at and it is the origin initially. It is acted by the force such that

find the time in which it will come to rest

(a)

(b)

(c)

(d) None of the above

(ii) Find the velocity of body as a function of time

(a)

(b)

(c)

(d) None of the above

(iii) Find the value of at which its velocity become

(a)

(b)

(c)

(d) None of the above

Question 2: Matrix match type-

A boy of weight W is standing in an elevator. Find the force of the boy feel

 Column A Column 2 (a) When the elevator stands still (P) (b) When the elevator moving with constant velocity downward (Q) (c) When the elevator moving with constant velocity upward (R) (d) Moving up with acceleration (S) No appropriate match (e) Moving down with acceleration

Question 3:

(i). A object is subject to three forces

Find the acceleration of object

(a)

(b)

(c)

(d)

(ii) Which of the following expression is correct if at , object is at origin and velocity is

(a)

(b)

(c)

(d) None of the above

Question 4:

A particle of weight W resting a smooth inclined plain AB with the help of force F acting on the particle at angle with the line AB. Find the force F and normal reaction

(a)

(b)

(c)

(d) None of the above

Question 5:

Match the Column

 Column A Column A (a) (P) (b) (Q) (c) (R) (d) (S)

Question 6:

A boy pushes a mass with a force F. Confident of friction between body and floor is and between boy shoe and floor is . There mass is and respectively.

(i) What maximum force boy can apply without slipping

(a)

(b)

(c)

(d) None of the above

(ii) What is the condition required to move the block without slipping

(a)

(b)

(c)

(d)

Question 1:

(i) = (a)

(ii) = (a)

(iii) = (a)

(iv) = (b)

Question 2:

(a) = (P)

(b) = (P)

(c) = (P)

(d) = (Q)

(e) = (R)

Question 3:

(i) = (b)

(ii) = (a)

Question 4: (b)

Question 5:

Question 6:

(i) = (c)

(ii) = (a)