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

**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.**