Answer all the questions except question no. 1
Answers
Answer:
question no 7
speed
1- It is the distance travelled by a body in unit time.
2- It is a scalar quantity.
3- It is always positive.
4- speed tells how fast a body is moving.
Velocity
1- It is the distance travelled by a body in a particular direction in unit time .
2- It is vector quantity.
3- It may be positive, negative or zero depending on the direction of motion.
4- Velocity tells how fast A body is moving along a particular direction.
distance
1- length of the actual path travelled by the moving body irrespective of the direction in certain interval of time is called distance.
2- it is scaler quantity.
displacement
1- distance between initial position and the final position of a moving body in a particular direction is called displacement.
2- it is not scaler quantity.
uniform
1- a body travel equal distance in equal interval of time along a particular direction is called uniform .
2- eg a stone dropped from the top of a tower.
non- uniform
1- a body does not cover equal distance in equal interval of time in a particular direction is called non uniform.
2- eg a car moving on a crowded road .
question no 8
A body is said to be motion when it change it position with respect to it surrounding is called motion. A man walking on a road, A boy playing in a playground, etc are the state of motion .
one thing is common in every morning object is it keep changing its position continuously with respect to a reference point .
question number 9
the inability of a body to change by itself its state of rest or state of uniform motion along a straight line unless an external force act on it is called inertia. for example if a book is lying in a rack the book will continue to remain in the rack until some external force is applied to remove a displaced it from its rest position . if a bus is at rest on the road the bus will continue to be at rest on the road until it engine apply Force for moving . on the other hand if a train is moving on IT railway track it keep on moving for a long time until brakes are applied . the train stop after sometime due to opposite force acting between its wheel and the railway track .
question number 10
in 1686 80 Newton formulated three fundamental law that gover the motion of objects. this three law are known as Newton Law of Motion . Newton first law of motion give a precise definition of inertia and force . Newton's second law of motion establish the relationship between force acting on a body and acceleration produced on it . his third law of motion establish the relationship between the action and the reaction force .
question number 11
it is our common experience that if two bodies of different mass are moving with the same velocity is brought to rest by applying force .the force needed to stop the heavier body is more than the that of the lighter body .similarly if two bodies of the same mass are moving with the different velocities the force needed to stop the faster moving body is more than for the slower moving body . does the force needed to stop a moving body in a definite time depend on the mass of a body and its velocity . actually the force needed to stop a moving body in a given time depend on the product of mass and velocity . to understand this term let us review some common observation .
1- in the game of Table Tennis if the ball hit a player he won't be hard but a cricket ball moving at the same speed as the tennis ball hit a structure he is heard this is because cricket ball is much heavier than the table tennis ball .
2- a truck moving at the speed of 10 metre per second square may kill a person coming its way this is because heavy mass of the truck .
we observe that impact of motion produced by a object depends on the mass and velocity . there must be some quatity of important that combined mass of a body and velocity of the body . we define momentum of a body as product of mass of a body and its velocity . Momentum is a vector quantity processing both the magnitude as well as direction . the direction of a Momentum is towards the direction of velocity .