dynamics

Question 1

N1L states that …

Answer 1

body will continue in state of rest/motion in straight line unless net ext force act on it

Question 2

linear momentum p of a body is defined as

Answer 2

product of mass and velocity

Question 3

p =

Answer 3

mv

Question 4

N2L states that…

Answer 4

rate of change of momentum of a body is proportional to resultant force that acts on it and momentum change takes place in direction of force

Question 5

F =

Answer 5

dp/dt

Question 6

change in momentum =

Answer 6

mv - mu

Question 7

n3l states that

Answer 7

body a exerts force on b, b exerts a same type of force of equal magnitude but opp direction on body a

Question 8

action reaction force must fulfil these conditions:

Answer 8

act on 2 diff obj
same type
same magnitude
opp direction
exist in pairs

Question 9

is NCF action reaction with W

Answer 9

NO. although they are same in magnitude, they share the same object

Question 10

principle of conservation of momentum states that

Answer 10

total momentum of a system is constant, provided no ext Fr acts on it

Question 11

what are perfectly elastic collision

Answer 11

total KE is unchanged/conserved
m1u1 +m2u2 = m1v1 +m2v2