Motion

My ideas on laws of motion

Motion can be defined as the change of position with respect to time and reference point. Motion can explained by five major aspects.

1. Displacement
2. Velocity
3. Time
4. Direction
5. Acceleration

Velocity

Velocity can be defined as speed with direction. When we say that our vehicle is moving with the speed of 50 km/ph towards north so here we are dealing with velocity as we are talking about the direction.

Displacement

Displacement can be defined as the straight line distance between final and initial point. The distance between two point can be curved along the path the object has moved but displacement is always in a straight and shortest path. This can be calculated by using the simple formula

x2 - x1= s

As displacement is a vector quantity fascinating frames can be made using this the units of measurement is same as the measurements of  distance. 

Time

Time is the dimension of space and is a measure relative to which any thing moves and act from past to present and further to future.

second	1 sec	SI base unit
decasecond	10 seconds
minute	60 seconds
moment(historical)	1/40th of an hour	used by Medieval Western European computists.[29]
hectosecond	100 seconds	1 minute and 40 seconds
ke	864 seconds	traditional Chinese unit of decimal time duration, usually 1/100 of a day. 14 minutes and 24 seconds. (Nearly 1/4 of an hour.)
kilosecond	1,000 seconds	16 minutes and 40 seconds
hour	60 minutes
day	24 hours	longest unit used on stopwatches and countdowns
week	7 days	Also called sennight
megasecond	1,000,000 seconds	About 11.6 days
fortnight	14 days	2 weeks (more common in Great Britain)
lunar month	27.2–29.5 days	Various definitions of lunar month exist.
month	28–31 days
quarter and season	3 months	The duration of any of the four calendar seasons; winter, spring, summer and autumn.
year	12 months

Direction

Direction gives us information of  relative position between two points.

Acceleration

According to me acceleration is a very interesting topic in physics. Acceleration is the change in velocity over unit time. Some time velocity of an object declines and this phenomena is called retardation. Acceleration can be measured using a simple formula. The formula cays that the difference of final and initial velocity divided by unit time is equal to acceleration. 

v-u/t

Newtons law of motion

Their are three laws of motion

1  .When viewed in inertial frame every object remains at rest or at constant velocity until any net force is applied on it.This law is also called the law of inertia, inertia is the property of a object in motion to resist rest.This can be mathematically written as

f=o so dv/dt =o

   
2  .Vector sum of the forces on an object is equal to the product of mass and the sum of acceleration. this also involves the concept of momentum. Momentum is the product of mass and velocity. It is also the property of a object in motion to resist rest.

f=dp/dt=d(mv)/dt

Second law states that the net force is equal to the rate of change in linear momentum.

f=m(dv/dt)=ma

Second law can be also written in form of acceleration.

3  .When an object exerts force on other object equal and opposite force returns to the first object.

Types of motion   

• Simple harmonic motion – (e.g., that of a pendulum).
• An harmonic motion
• Periodic motion
• Rectilinear motion
• Reciprocal motion (e.g. vibration
• Brownian motion (i.e. the random movement of particles)
• Circular motion (e.g. the orbits of planets)
• Rotary motion – a motion about a fixed point. (e.g. Ferris wheel).
• Curvilinear motionn – It is defined as the motion along a curved path that may be planar or in three dimensions.
• Rotational motion
• Rolling motion - (as of the wheel of a bicycle)
• Oscillation
• Projectile motion
• Combination motion