 # Force Conceptual Problems and Solution

Question 1
Which is true from Newton's Third law of motion?
a. For every action force there is a 50% reaction force in the opposite direction.
b. For every action force there is an equivalent reaction force in the opposite direction.
c. Both 1 and 2
d. None of the above

Question 2
According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move?

Question 3
In the equation $F = ma$, what does m represent?
(a) Mass
(b) Meters
(c) Force
(d) Acceleration

Question 4
Arrange the items in order of increasing inertia?
Bicycle, bus, Train, car, Scooter

Question 5
What is the difference between balanced force and unbalanced force?

Question 6
Newton's First Law of Motion is also called:
a. Law of Friction
b. Law of Reaction
c. Law of Action
d. Law of Inertia

Question 7
State the various effects of force?

Question 8
True and False Statements
A. Momentum is a vector quantity
B. Rate of change of momentum is called Force
C. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion
D. when a bullet is fired from the Gun and gun recoil. This is based on law of inertia
E. The unit of momentum is Kg-m
F. Force is a scalar quantity
G. Action �Reaction pair of force act on different body
I. A object can still run with non-zero velocity event the net force acting on the body is zero

Question 9
Give reason for each of these
S.No. Question Reason
1 Why can dust be removed by shaking it, or beating it by a carpet?
2 Why do passengers in the bus tend to fall back when it starts suddenly?
3 Why is it difficult for a fireman to hose, which ejects large amount of water at a high velocity?
4 Why is it advised to tie a rope on the luggage while you travel by the bus?
5 Why do passengers jumping out of a rapidly moving bus fall forward with his face downwards, if he does not run forward?
6 Why the cricket player moves his hand backwards on catching a fast cricket ball
7 What is the use of seat belt in Cars

Question 10
State the Law of Conservation of Momentum. Deduce this from Newton's second law of motion?

Reference Books for class 9 science

Given below are the links of some of the reference books for class 9 science.

These books by S.Chand Publications are detailed in their content and are must have books for class 9 students. Some other books that might be worth considering are
1. Oswaal CBSE Question Bank Class 9 Science Chapterwise & Topicwise We all know importance of practicing what we have studied. This book is perfect for practicing what you have learned and studied in the subject.
2. Pearson Foundation Series (IIT-JEE/NEET) Physics, Chemistry, Maths & Biology for Class 9 (Main Books) | PCMB Combo These Foundation books would be helpful for students who want to prepare for JEE/NEET exams. Only buy them if you are up for some challenge and have time to study extra topics. These might be tough for you and you might need extra help in studying these books.
3. Foundation Science Physics for Class - 9 by H.C. Verma This is one of my favorite Physics book for class 9. Most of the book is within the limits of CBSE syllabus. It might overwhelm you with its language but I feel if you can understand the content is authentic with plenty of problems to solve.

You can use above books for extra knowledge and practicing different questions.

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