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Physics 9 Chapter 3 - Dynamics - 13
1.
Which law states that “To every action there is always an equal but opposite reaction”?
a) Newton’s third law of motion
b) Newton’s second law of motion
c) Newton’s first law of motion
d) Newton’s fourth law of motion
2.
In which direction the weight of the book is acting on the table?
a) Left side direction
b) Upward direction
c) Downward direction
d) Right side direction
3.
The reaction of the table acts on the book in the ................ direction?
a) Right side
b) Upward
c) Left side
d) Downward
4.
On which principle rocket works?
a) Newton’s second law of motion
b) Newton’s fourth law of motion
c) Newton’s third law of motion
d) Newton’s first law of motion
5.
Stretch out your palm and hold a book on it. What is the action?
a) The palm
b) Air pressure
c) None of these
d) The weight of the book
6.
Stretch out your palm and hold a book on it. What is the reaction?
a) The palm
b) Air pressure
c) The weight of the book
d) None of these
7.
Stretch out your palm and hold a book on it. What is the direction of reaction?
a) Right side
b) Left side
c) Upward
d) Downward
8.
What must be the relation of tension T in the string and weight w of the block suspended with that string?
a) (a) Both b and c
b) (c) Opposite
c) (d) Same
d) (b) Equal
9.
If the body A moves downwards and its weight m
1
g is greater than the tension T in the string. Then, what will be the formula of Net Force?
a) Net Force acting on body A = (m
1
g - T) + m
1
g
b) Net Force acting on body A = (m
1
g + T) - m
1
g
c) Net Force acting on body A = m
1
g - T
d) Net Force acting on body A = T- m
1
g
10.
In which direction weight of the block pulls the string?
a) Upward
b) Left side
c) Right side
d) Downward
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