If an object is moving at a constant velocity the object is supposed to be in that type of motion unless there is an external force acting on it.
If an object is stationary it will continue to be so unless there is an external force acting on it. 
That sums up the first physics law if motion.
Imagine if you are standing on the bus and it suddenly moves from rest.
You will fall backwards because your body wants to continue to be at rest yet your feet moves forward as it’s firmly placed on the ground, assisted by static friction.
The differential rate of reaction of your body and your feet means that you moved backwards.
So unless you want to knock into somebody else intentionally behind you please hold on to the handrail.
Now that you steady yourself and stand erected while the bus is moving with constant velocity you can start enjoying the ride.
However if the bus driver brakes suddenly, you will find your body movingto the front as the body is stubborn enough to try to maintain it’s original motion, which is in constant velocity.
Yet your feet, firmly stucked on the platform reacted slower due to static friction therefore the differential rate of reaction means that you will move to the front abruptly.
Knowing this, please ensure that you hold on to the handrail unless you want to get flung forward to the front for whatever reasons.
The stubbornness to change it’s original motion is called inertia.
In quantitative terms it’s measured usually in the units of kilogramme.
Inertia is associated to mass.
The greater the mass the higher is the inertia.
Now you know why is it that when you have a huge object in front of you perhaps it’s better to go around the object rather than to try to face it upfront.
In life, if there s a great obstacle that you cannot surmount directly maybe you can try to go around it.
What’s more important is to ensure the object no longer obstructs your path and you move forward.
If you do not take action today to change anything you will still be in the same position.
If you do not take action tomorrow nothing will change.
Taking actions, akin to external force, will change your original position.
Therefore if you want to change how you live your life, you need to take action now.
As you can see, the first law of motion is clearly consistent in how we should live our life.
Physics is indeed everywhere.
Where were you when I was in form 5?!!!
Looks like we were miles apart 🙂