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Question no 4 and 5
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Answers
Answer:
explain the difference between rest and motion give two example of each.
Difference Between Rest and Motion With Examples
In physics, rest and motion are two different states of a body. In this post, we will learn about these two states and try to find out what is the difference between rest and motion.
A body is said to be at rest if its position does not change with respect to its surroundings. Whereas, when the position of a body changes with respect to its surroundings, it is said to be in motion.
The state of rest and motion of the body is relative to each other. A body can be both at rest and in motion at the same time.
REST
If we look around us, we observe that many objects do not appear to move. Thus we consider them at the state of rest.
Examples for the State of Rest:
A book lying on the table will not change its position if it is not disturbed. So, it is in a state of rest.
A bench in a park fixed under a tree is at rest as there is no change in its position.
Therefore, when the position of a body with respect to its surroundings does not change with time, the body is said to be at rest.
Definition of Rest in Physics
A body is said to be at rest if its position does not change with respect to a fixed points in its surroundings.
Difference between rest and motion with examples. Examples for the state of rest in physics are A book lying on the table will not change its position if it is not disturbed. So, it is in a state of rest. A bench in a park fixed under a tree is at rest as there is no change in its position.
MOTION
Unlike the above, we find that many things around us move from one place to another. A flying bird, a moving bus, a boy playing football, an oscillating pendulum of a wall clock, a moving train, a sailing ship, a walking man, etc. are some of the examples of motion.
A moving object keeps on changing its position continuously with time with respect to a fixed point called the reference point.
Examples for Motion:
When a moving car changes its position with respect to a tree or a lamp post by the side of the road, the car is said to be in motion.
A flying bird is also said to be in motion as it changes its position with respect to stationary objects such as trees.
Hence, when the position of a body with respect to its surrounding changes with time, the body is said to be in motion.
Definition of Motion in Physics
A body is said to be in motion if its position continuously changes with respect to its surrounding changes with time.
Answer:
Ans-4:-Rest: If a body does not change its position with respect to its surroundings, the body is said to be at rest. E.g. A table lying in a room is at rest with respect to the walls of the room. Motion: A body is said to be in motion if it changes its position with respect to its surroundings.
Ans-5:-(i) Rectilinear motion the body travels in a straight line whereas in curvilinear motion the body travels in a curved path. In rectilinear motion the body can travel with uniform velocity whereas in curvilinear motion the velocity keeps changing as the direction keeps changing.
(ii)Rotation of the Earth is its turning on its axis. Revolution is the movement of the Earth around the Sun.
Eg.:-(i)Hot water that falls into a tea cup from a vending machine is in rectilinear motion. Athletes running the 100-meter dash along the track are in rectilinear motion.
(ii) Earth's orbit around the sun is an example of revolution and it's rotation on its own axis.