Question

1) What do you mean by inertia? How is it related with inertial mass?

2) Interpret the meaning of balanced and unbalanced force with examples.

3) Define momentum. State its S.I. unit. On what factors does a momentum of a body depend?

4) How is Newton’s first law of motion interpreted from Newton’s second law of motion?

5) Why does a passenger experience a forward push when a running bus stops suddenly?

6) Explain why does a cricket player move his hands backwards, while catching a fast cricket ball.

7) A ship whose mass is 5x107kg is initially at rest is pulled by a force of 15x104N through a distance of 10m. If the

resistance due to water is negligible then what is the speed of the ship.

8) A bullet of mass 10g is fired with a rifle. The bullet takes 0.003s to move through its barrel and leaves it with a

velocity of 300m/s. What is the force exerted on the bullet by the rifle.

9) A 20g bullet pierce through a plate of mass m1=1kg and then comes to rest inside a second plate of mass

m2=2.98kg. It is found that the two plates initially at rest, now moves with equal velocities. Find the

percentage loss in the initial velocity of the bullet when it is moving between m1 and m2. Neglect any loss of

material of the plates due to action of the bullet.

10) Explain why a car does not move when the force is applied on it by a person present inside the car?

11) A bullet of mass 20g starts from rest from one end of the barrel of gun 1.5m long and weighing 40kg. The

bullet leaves at the other end with a velocity of 350m/s. Calculate (i) the time taken by the bullet to leave the

gun and (ii) the velocity of the recoil of the gun.

12. What is the difference between distance and displacement? Give two points. 14. Prove graphically and

analytically following equations of motion: (i) V=U + at (ii) v2 =u2 +2as (iii) S=ut+1/2at2

13. Draw velocity time graph when the acceleration is non-uniform. Also draw a velocity time graph of a stone

thrown vertically upwards and then coming downwards after attaining the maximum height.

14. What are different types of motion around you, state with examples?

15. Abdul while driving school computes the average speed for his trip to be20 Km/hr. On his return trip along the

same route there is less traffic and average speed is 40Km/hr. What is the average speed for Abdul's trip?

16. Draw velocity time graph for a body moving with constant acceleration and non-zero initial velocity.

17. Give one example of a situation in which a body has a certain average speed but its average velocity is zero.

18. Joseph jogs from one end A to the other end B of a straight 300m road in 2 minutes 30 seconds and then turns

around jogs 100m back to point C in another 1 minute. What are Joseph’s average speed and Velocities in

jogging from (a) from A to B (b) from A to C?

19. Convert 15 km/h to m/s and m/min.

Answer 1

Hey mate!

Here's your answer!!

Q1. Inertia is a property of matter that causes it to resist changes in velocity.

The concept of inertial mass has served its purpose, but, it is now outdated, and, (critically) flawed. There is only one valid concept of mass, invariant mass: m*m=E*E-p*p. Try to make sense of inertial mass for relativistic particles, and, the concept of inertial does not cling to law of Newton, dp/dt = m*dv/dt: In relativism acceleration depends on velocity, and, it is not necessarily collinear with force, dp/dt. Inertial mass is Newton's concept. It works approximately for all we are concerned with, for non-relativistic particles. No one would even notice that it is flawed. Inertia is the tendency for an object to keep moving at a constant velocity. It is a consequence of momentum conservation.

According to Newton's first law of motion, an object with a given velocity maintains that velocity unless acted on by an external force. Inertia is the property of matter that makes this law hold true.

$hope \: it \: helps \: you...$
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Answer 2

A18. Here we have,

Distance from point A to B = 300 m

Time taken = 2 minute 30 second = 2 x 60 + 30 s = 150 s

Distance from point B to C = 100 m

Time taken = 1 minute = 60 s

(a)  Average speed and velocity from point A to B

(b)  Average speed and velocity from B to C