why do a passenger fall in the forward direction when a moving bus brakes to a stop and Falls backward when it accelerates from rest

When a bus starts moving suddenly the part of passengers body in contact goes forward but the upper portion of his body remain at rest as per the rule this is the reason why the passenger fall back

when a bullet is fired it exerts a pressure backward give reason

According to the third law of motion every action has opposite and equal reaction and both action and reaction work on different bodies when a bullet is fired out it exerts action force on the gun backward. This is the reason a man handling the gun is pushed backward

why do you fall in the forward direction when a moving bus brakes to a stop and Falls backwards when it accelerates from rest

When a moving vehicle carries a passenger both the vehicle and the passenger move with the same speed in the same direction when the vehicle stops suddenly the portion of assigner's body that remains in contact comes to rest but the upper part of the body wants to remain in the previous condition and hence it bends forward

explain why is is it difficult for a Fireman to hold a hose which ejects large amount of water at a high velocity

The water rushing out a pipe exerts a backward pressure. Since the velocity of water rushing through pipe remains very fast the backward pressure on the pipe too is very fast. As such it is very difficult for a Fireman to hold the pipe

why is it it advised to tie any luggage kept on the roof of a bus with a rope

The velocity of Air on the roof of a bus is felt very high. The luggage placed on the roof of a bus moves as fast as the bus when if fast moving bus change its direction the luggage placed over the roof may be  thrown away due to its inertia. Hence the luggage is tightly bound on the roof to protect it against falling away

in cricket a fielder gradually pulls his hands backward while taking a catch why

The fielder tries to spend more time to reduce the velocity of the ball. Thus the impact of fast ball on hand is reduced. In the body is checked suddenly the rate of change of momentum of the ball may be Tu Hai which can couch injury e in the hands of a fielder

if action is always equal to the reaction explain how horses can pull a cart

Leg of horse imposed pressure on ground at certain angle the Earth surface also impose similar force on the Leg of the horse in opposite direction the pressure imposed by Earth had two components vertical component and horizontal component the vertical component balance the weight of the horse and the cart the card is pulled forward due to origin till component

Two trucks han moving on a road with equal velocity one of the two who is entity and the other full of load which truck will need more force to stop

The loaded truck. Because the inertia of loaded truck will be more than the same of the empty truck

explain why why some of the leaves may gate detached from a tree if we vigorously sake its branch

Leaves attached to some branch of a tree remain at rest due to inertia of rest. When a branch is shaken vigorously the branch goes into motion due to the external force since leaves wish to remain at rest due to inertia of waste they fall down under gravitational force after being detached

what happens when you exert a pressure on the wet cloth clarify your observation

In this case the cloth go into motion and water droplets fall down due to inertia of rest

when a carpet is beaten with stick dust comes out of it explain

 when a carpet is beaten by a stick it becomes mobile. On the other hand dust particles remains in the collection of the rest due to inertia of rest. Thus on beating they go away from carpet

an object experiences a net zero external unbalanced force. it is possible for the object to be travelling with a non-zero velocity? if yes state the condition that must be placed on the magnitude and direction of the velocity. if no provide a reason

It has two States :-

1. The object is in the state of raised the answer of the question is no. Because an object remains in its initial state only in absence of unbalanced force as per Newton's first law of motion.
2. If resultant of all the force acting on an object is zero the object will move with its initial velocity and the answer in this condition will be yes.

write impacts of a force

 following are the impact of force :-

1. It Change speed of object.
2. It change the direction of the motion of object. 
3. It change the shape of an object.

what is interaction

 the process of impacting two objects by imposing courses on each other is called as interaction

write the law of conversation of momentum

The addition of momentum of two quantities remains equal before and after their collision. It means the total momentum of two objects remains unchanged and conserved in the process of their collision. Collision is an event in which two or more bodies exert forces on each other for relatively short time

define momentum

 momentum momentum of an object is its property which organelles due to combined effect of mass and velocity and its measurement is done by the product of mass and velocity.
  its unities is kg m/s and it is a vector quantity

write Newton's third law of motion

Every action has equal and opposite reaction action and reaction both work on different bodies

write Newton's second law of motion

The acceleration produced in a body by an unbalanced force is proportional to the force and inversely proportional to the mass of the body. The direction of acceleration is always in the direction of force.

what is friction force

When an object moves on a surface aur tries to move on it and opposite force act on the surface of contact with rssists moment or tries to do so. This force is called as a friction force

define inertia

 that property that property of an object due to which it remains at rest if it is at rest or it remains in motion is it is in motion is called as inertia