Motion, in physics, change with time of the position or orientation of a body. ... All motions are relative to some frame of reference . Saying that a body is at rest, which means that it is not in motion, merely means that it is being described with respect to a frame of reference that is moving together with the body.
Are the states of rest and motion relative?
The states of rest and motion are relative , that depends on the observer’s frame of reference.
Why are state of motion and rest considered relative?
Rest and motion are the relative terms because they depend on the observer’s frame of reference . So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body.
What is state of motion relative to?
Thus we can conclude that the state of rest and motion are relative to the observer . Note: The state of the body depends on the position, time and the position of the observer. ... For different observers, the same body might be in different states of motion or rest.
What is the simplest type of motion?
The simplest form of motion is the motion in a straight line . The distance and displacement are the quantities used to determine the final position of the object with respect to the initial position.
Who said all motion is relative?
Galileo was the first to point out the obvious: all motion is relative. When I say something like “the ball is traveling at 50 mph towards me,” I implicitly add “relative to my head.” If I’m on a train, someone standing on the platform would add the speed of the train to the speed of the ball to get the “total” speed.
Why do physicists say motion is relative?
The statement that motion is relative is an important concept in physics. ... This is important because the observed motion may appear different depending on which frame of reference it is being observed from. Because of this, relative velocity must be used to explain movement within a certain frame of reference.
What is meant by motion is relative in nature?
Relative motion is the calculation of the motion of an object with regard to some other moving or stationary object . Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
What do you mean by state of motion?
The state of motion of an object is defined by its velocity – the speed with a direction . Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity – and (in the absence of an unbalanced force) will remain with a zero velocity.
What is mean by state of motion and state of rest?
State of rest: Rest is the state of an object being stationary relative to a particular frame of reference or another object . ... State of motion: The state of motion of an object is defined by the speed with direction relative to a particular frame of reference or another object.
How can you say motion is relative?
For example, there is a man in a moving car and a man standing on the road. The car is moving, with respect to the man standing on the road, whereas the car is at rest with respect to the man sitting inside it . Thus, we can say that motion is relative.
What is motion class 9?
An object is said to be in motion when its position changes with time . ... The total path covered by an object is said to be the distance travelled by it. • The shortest path/distance measured from the initial to the final position of an object is known as the displacement.
What is the simplest type of motion class 9th?
The simplest type of motion is the motion along a straight line . Two different quantities Distance and Displacement are used to describe the overall motion of an object and to locate its final position with reference to its initial position at a given time.
What is rectilinear motion?
If a particle is restricted to move along a straight line , its motion is called rectilinear (or linear) motion. Such a motion can be described using one coordinate only.
Who said speed relative?
“ Einstein concluded that simultaneity is relative; events that are simultaneous for one observer may not be for another,” the encyclopedia stated. “This led him to the counterintuitive idea that time flows differently according to the state of motion, and to the conclusion that distance is also relative.”
Is speed of light relative?
The speed of light is constant relative to everything . ... Light differs only in that everyone perceives light to have the same relative speed; 299,792,458m/s in a vacuum.
