Newton's first and second laws of motion NCERT Question Answers Grade 11th

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[Newton's first and second laws of motion NCERT  Question Answers Grade 11th] .



1. Three blocks A, B and C of masses 4 kg, 2 kg and
1kg respectively, are in contact on a frictionless
Surface, as shown in Fig. 5(CF).1. If a force of 14
N is applied on the 4 kg block, then the contact
force between A and B is

FIGURE 5(CF).1


(a) 6 N
(b) 8N
(c) 18 N
(d) 2N (AIPMT 2015)

2. A balloon has 8 g of air. A small hole is pierced
into it. The air escapes at a uniform rate of 7 cm/s. If the balloon shrinks in 5.6 s, then the average force acting on the balloon is.


(a) 10 -4N
(b)10-2dyne
(c) 56 dyne
(d)10-6N

3. In Fig. 5(CF).2, the position time graph of a
particle of mass 0.| kg is shown. The impulse at
t= 2 sec. is




(a) 0:2 kg ms-1
(b)0.0kgms-1
(c) 0.1 kg msms
 (d)0.4kgms-1

ANSWERS
1. (a)  2. (a)  3. (a)

Newton's first and second laws of motion NCERT  Question Answers Grade 11th 

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