# Force and Laws of Motion: Important Questions & Preparation Tips

In this article students can find CBSE Class 9 Science chapter, **Force and Laws of Motion:** **Important Questions & Preparation Tips** for Semester Assessments-I 2017. The questions have been prepared to cover all the important topics of the chapter. Students can solve these questions to revise the chapter and track their preparation level for the next exams to come.

Get the CBSE Class 9th Science chapter, Force and Laws of Motion: Important Questions & Preparation Tips. This will provide you with a very clear idea about what type of questions are being framed for the exam and from which topics. The pattern in which the question paper is set is quite different from the style in which the course structure is actually defined. Consider the below mentioned terms/questions at the time of preparation.

**Revise the Important Tips for the chapter Force and Laws of Motion and then opt for the Important Questions:**

- Concept of force and example of force in daily life.
- Mathematical definition of force
- Effects of force
- Classification of force on the basis of interaction
- Can force change the shape and size of an object?
- Define balance and unbalance force with one example
- Difference between balance and unbalance forces
- Graphical representation of time and velocity for balance and unbalance force
- Definitions of all the laws of motion with their formulae
- What is inertia? Concept of inertia in reference of motion
- Two similar bodies having the masses of 5 kg and 10 kg. Which one will have greater inertia?
- The mass of an object is a measure of its inertia. Explain with example
- What is the reason to provide a groove in a saucer for placing the tea cup?
- Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.
- Second law of motion is very important. Study the mathematical derivation of Newton’s second law
- Study the given table carefully

**What happens when:**

- A bus starts suddenly
- A passenger jumps out from a moving car
- A car enters a curved path
- Numerical based on equation from the derivation of second law
- A constant force acts on an object of mass 5 kg for a duration of 2 s. It increases the object’s velocity from 3 m sñ1 to 7 m s
^{-1}. Find the magnitude of the applied force. Now, if the force was applied for duration of 5 s, what would be the final velocity of the object? - Rate of change of momentum is called as _________
- What is momentum and what is the unit of momentum?
- Examples of non-contact forces
- While catching a fast moving ball, fielder gradually pulls his hand backwards. Reason?
- State Newton’s third law of motion and its applications
- Give examples from daily life where Newton’s third law is applicable
- Concept of conservation of momentum through derivation
- A bullet of mass 20 g is horizontally fired with a velocity 150 m s-1 from a pistol of mass 2 kg. What is the recoil velocity of the pistol?
- If action is always equal to the reaction, explain how a horse can pull a cart.
- An object of mass 100 kg is accelerated uniformly from a velocity of 5 m sñ1 to 8 m sñ1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

**Practice the examples and exercises given in the NCERT text book**

**If you have any Question/Point on the above information, please ask/discuss it in the** **CBSE Group.**