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Physics > Mechanics > Flashcards

Mechanics Flashcards

1
Q

Father of mechanics

A

Newton

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2
Q

Father of modern physics

A

Max plankck
Medieval newton
Ancient galileo

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3
Q

Kinematics

A

Motion of the body

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4
Q

Dynamics

A

Motion of the body along with reasons

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5
Q

Scalar quantities

A

Which has only magnitude but no direction
Vector has both mag and direction

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6
Q

Vector quantities

A

Velocity displcement acceleration force impulse momentum weight torque

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7
Q

Displcement

A

The shortest path between two points called displcement
Sometimes it will be negative or zero

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8
Q

First law of equation

A

V= u + at
Equation descibes about velocity and time

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9
Q

2 nd law of equation

A

S= ut+ 1/2 at2
It describes about time and position

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10
Q

Third law of equation

A

It describes about the velocity and displcement

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11
Q

Different masses are dropped from certain height which one reach first

A

All are reach at ssame time
Galileo
We can’t observe because air create disturb
In vaccum all are reach at a same time

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12
Q

Newton first law

A

Law of inertia
Inertia at rest
Inertia at motion
Inertia at direction

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13
Q

Newton second law

A

The amount of force applied on object is directly proportional to mass of the object and it’s acceleration
F= ma

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14
Q

Momentum

A

Masa * velocity

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15
Q

If it has mass and velocity

A

It has also momentum

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16
Q

Conservative laws of linear momentum

A

Sum of momentum before collision is equal to sum of after collision
Without collision where we observe
Gun fire
Canon tank
Rocket motion
Bomb explosion
Bullet and wooden block

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17
Q

Impulse

A

The large force acting on a body within short span of time
Nail with hammer
Axe to cut tree
Ball with bat
Hockey stick
Force * time cgs dyne sec
Impulse also called change in the momentum

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18
Q

Reducing the impulse

A

Shock absorbers are used in the automobiles
Soft materials are filled in the long jump
Takes his hands back before catching the ball
Egg on bed
Mobile packing
Helmet wearing

19
Q

Newton third law

A

Every action there is also opposite reaction
Running. Swimming
Flying bird
Rocket. Missiles and jet flights

20
Q

Work

A

W = f * displacement
Product of Force and displacement
Nm - joule
Cgs dyne cm called erg

21
Q

One joule

A

10 to the 7 erg

22
Q

One newton

A

10 to the power 5

23
Q

If angle given between force and displacement

A

W= fscos@
Positive
Negative
Zero

24
Q

Positive work

A

Force and displacement are in same direction
Degree lies less than 90
Object kept above the surface of the earth
Koolie kept object
Bulb at some height
Pe =Mgh

25
Q

Negative

A

Force and displacement are opposite in direction
Only obaerved in ramps

26
Q

Zero work

A

W=fscos@
If f= 0 w = 0
S zero work zero
90 work zero
Railway cookie force and 90 so work is zero
Carrying suitcase is also work zero

27
Q

Power

A

The rate of doing work
Pani retunu called work
P = work / time
Si joule) / sec called James watt
Invented steam engine
Cgs unit erg / sec

28
Q

One hp

A

746 wats

29
Q

Energy

A

The capacity to do work is called energy
Potential energy
Kinetic energy
Si unit joule

30
Q

Potential

A

The energy possessed by the body of it’s position or place
Stored energy
Pe = mgh
Strectched rubber
Catball stored energy
An arrow inthe bent bow
Water stored in a reservoir
A stone on the top of a mountain
The ending point of the potential energy is the starting point of ke
Raised hammer
Raised axe
Pounding rod
Calling bell
Compressed cycle bell

31
Q

Kinetic energy

A

The energy possessed by a body due to its motion
1/2 mv2

32
Q

The relationship between kinetic energy and linear momentum

A

P^2 /2m

33
Q

If the velocity of the body doublee then ke will be

A

Four times

34
Q

If the momentum of the body doublee then kinetic energy also

A

Four times

35
Q

If the velocity of the 1/3 then ke will be

A

1/9

36
Q

Mechanical energy

A

Aeroplane
Kiye
Clouds
Rocket motion
Flying bird

37
Q

Friction

A

Surface irregularity
Roughness of the surface

38
Q

Advantages of a friction

A

Walking running writing

Holding the things
Ignition of match stick
Breaking system

39
Q

Disadvantages of friction

A

Energy loss
Wear and tear
Depreciation
Life span decrease

40
Q

How to overcome the friction

A

Polishing
Lubricants
Ball bearings
Steam lining
Graphite used as lubricant

41
Q

Drag

A

Friction due to fluids

42
Q

Centripetal

A

Sun and solar system exam ple of centripetal
Gravitational force act as centrioetal
Electirns revolve nuckess and acts as electrostatic force

43
Q

Centrifugal

A

Away from the centre
Mixers
Grinders
Washing machine
Butter seperated from the milk
Seperation blood cells from the good
Seperation of sugar crystals from molasis
Seperation of honey from honey bee wax

Physics (9 decks)

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