Question

doubts on newton laws of motion

Answer 1

k thx for cming

Answer 2

how many types of inertia are there?

Answer 3

easmore?

Answer 4

Typically, we consider two. That associated with linear motion and that associated with rotational motion.

Answer 5

oh i was asking like inertia of rest ,inertia of motion,inertia of direction etc

Answer 6

They are all the same. Inertia is simply a measure of how an object resists a change in motion.

Answer 7

hmm. can u xplain inertia of direction and based on tht reason this:
wheels of vehicles are provided with mudguards

Answer 8

The mud has a tendency to always maintain the same direction of travel. Eventually, this tendency exceeds the forces acting on the mud by the tire. When this happens, the mud will leave the tire in a tangential manner.

Answer 9

doubt 2:a body of mass 2kg moves with an acceleration of 3 m/s^2 find change in momentum in in one second

Answer 10

y is it the answer force ma?

Answer 11

That is the definition of Newton's Second Law. \[F = {d \vec p \over dt}\]

Answer 12

doubt 3:what is average force?

Answer 13

\[F_{avg} = {\Delta \vec p \over \Delta t}\]

Answer 14

doubt 4:A shell explodes in mid air into 2 equal fragments.what is direction of motion of 2 particles .explain this

Answer 15

This is a result of internal forces only. Since Newton's Second Law considers only external forces, there are couple inferences we can draw.

Let's assume the shell is at rest when it explodes.

First, the center of mass of the two particles will remain at the same point in space.
Second, the net momentum of the two particles will equal zero (because the object is initially at rest).

Answer 16

can u xplain more i am cnfused

Answer 17

The exact direction and nature of the motion of the two particles after the explosion is dependent on the nature of the explosion force.

Answer 18

hw can we make such an assumption

Answer 19

y dont we consider gravity as external force?

Answer 20

?

Answer 21

Gravity can be considered. The center of mass of the two particles will follow the path prescribed by the external forces.

Answer 22

This is definitely classical mechanics.

Answer 23

eashmore?

Answer 24

Yes?

Answer 25

xplain

Answer 26

What are you confused about?

Answer 27

Let's keep things simple for now. Air resistance will change things.

Answer 28

wel wat is direction of motion

Answer 29

The motion of the individual particles is dependent on the nature of the explosion.

The center of mass however, will have motion as described by external forces.

Answer 30

my text says they move in opp directions

Answer 31

for cinservation of momentum

Answer 32

Their net momentum after the explosion must equal the momentum of the shell before explosion. Because momentum is a vector quantity, they will travel away from each other (i.e. their velocities will have opposite signs).

Answer 33

we assume it was at rest??

Answer 34

Let's take the simplest example. Take the shell to be on the ground, which is smooth. After the explosion the net momentum will be zero.

Answer 35

mth3v4 pls dont mess around

Answer 36

If the shell is in motion. The net momentum of the two particles will equal the momentum of the shell before the explosion.

Answer 37

k

Answer 38

hw do we recognize an internal force ?? u see i am vonfused with that

Answer 39

I already established this as being classical mechanics. Please don't comment if you don't have anything valuable to add.

Answer 40

I don't understand the question Aravind

Answer 41

wel u see an example like i hav a fan kept in a boat

Answer 42

then i turn the fan on facing the sail

Answer 43

Nvm. I understand.

An internal force is one that does not mechanical energy of a system.

Answer 44

the boat doesnt move

Answer 45

An internal force is one that does not change the mechanical energy of a system.

Answer 46

hw do we recognize that . u seei thought he wind from fan can move the boat

Answer 47

Newton's Third Law. The fan pushes the wind against the sail, but the wind pushes back on the fan. Since the fan and sail are coupled by the boat, the boat doesn't move.

Answer 48

ya u r spam

Answer 49

can u show a fig

Answer 50

eashmore?