How can a body change its state of rest or motion?
On action of an unbalanced external force, the body can change it’s state of rest or of uniform motion.This is precisely Newton’s 1st Law of motion.unbalanced : the net effect of force must not be zero, i.e., they must be unbalanced and not symmetric forces.
Why are motion and rest relative terms?
Motion:when the position of a body with respect to its surroundings changes with time, it is said to be in motion.Rest:when the position of a body with respect to its surroundings does not changes with time, it is said to be in rest.rest and motion are relative terms because an object can be in motion relative to one set of objects while at rest to some other set of objects. examplei)a boy sitting on a fixed bench under a tree is said to be at rest with respect to a moving bus ,but, the bench is situated on the earth and our earth also moves around the sun. So, the boy is in motion with respect to the earth.
When is the body said to be in rest and in motion?
Well, yes and no. In its own reference frame a particle is always stationary. In any other arbitrary inertial framework, it will always be perceived to be moving and each one of these differently. This is what led Einstein to conclude that there is no preferred reference frame. But in this sense, he really was not saying anything particularly distinct from Galileo. OK, he may have made up arbitrary coordinates, but really that does not change anything. However, because Michelson and Morley told him there was no Aether, he concluded that probably as Galileo would have done if asked, that there is no preferred reference frame. However, as Einstein himself later concluded when wanting to move forward to a development of GR in 1920, there has to be some sort of Aether. He just has no idea what it was and basically nobody else was interested in revisiting General Relativity. What everyone had missed is that the Aether was actually Gravitational Flux and Michelson and Morley had not picked it up because they were travelling with it. Gravitational Flux is the only valid reference frame when considering actual Physics rather than Perception, and it is dynamic and evolving and much less easy to work with than Cartesian or Polar Coordinate Systems that define 3D Space. So a body can only really be said to be in motion when it is moving relative to its gravitational reference frame, and if it is moving relative to that reference which it invariably will be, then it cannot truly be considered as stationary.
What is meant by the statement rest and motion are relative terms?
Rest and motion are relative terms.The statement means that one cannot be absolutely sure about his state of motion.Velocity is defined as the rate of change of position of a body with respect to time. But the change in position is measured with respect to something stationary, something which is not moving. This concept is vague. Lets imagine two scenarios.:Scenario 1:Imagine you are on a train sitting beside a window. Are you in motion or at rest?You see wildlife, flora and fauna, gushing past you, they are in motion with respect to you and vice-versa.When you are enjoying beautiful views, another train comes on a track parallel to yours, and it is travelling at the same speed at which yours is moving? You will see other people sitting in the other one as if both the trains are at rest. You are at rest with respect to them but on the other hand you are in a state of motion with respect to, the lovely peacock on the fields sitting calmly while you rush past.Scenario 2:Imagine you are running on a jogging track. How do you know that you are moving? Of course by observing surroundings, trees will be rushing past you.Now imagine that you are on a treadmill in the same jogging path. Are you in motion? The answer to the question will depend. You will not observe any change in position of trees or objects around you. But you are running right? You are in motion with respect to the belt of treadmill but at the same time you are at rest with respect to the surroundings.
What is the tendency of an object to resist any change in its motion?
Try to narrow things down a bit. Consider any object you've got at hand. Like your laptop or mouse. Can you describe what the laptop's gravity is? There is a gravitational force exerted by the laptop's mass, but its tendency is to make the laptop fall unless your desk or lap gets in the way. How about force? There is no force inherent to your laptop. All forces exerted by or on objects are the result of potentials or dynamics, for instance gravity above. Does distance have anything to do with it? Distance is not a property inherent to an object at all. It's the amount of space between objects. The answer is inertia. You can get a hint from the root word, inert (not doing anything). The greater an object's inertia, the more force is required to accelerate that object.
While sitting in a moving bus is it motion or rest?
Good question.It all depends on the frame of reference of the observer.If the observer is in the bus, their frame of reference is the bus. Relative to them, you’re motionless, whether the bus is moving or not.If the observer is standing by the side of the road and the bus is moving past them, their frame of reference is the road, and you’re in motion relative to them.If the observer is in another bus, their frame of reference is the other bus - and depending on whether it is moving at the same speed as your bus or not, you might be in motion or relatively stationary.Einstein had a lot to say about all that, and light. Relativity is fascinating.
An object at rest with respect to one object can be in motion with respect to another object. Do you agree?
Thanks for the A2A Rishabh Kakkar.I think it is very simple. The answer to your question is Yes, it is possible.Suppose you and your friend are in a train which is moving with 'x' m/s. Now you are and your friend are at rest with respect to each other. But consider somebody outside the train. For that person both of you are in motion. This is known as the concept of relative velocity.
What is the difference between rest and motion?
Motion:-A body is said be in a state of motion if it changes its position continuously with respect to its surroundings with the passage of time.E.g A bus running on a road, a flying bird etcRest:- A body is said to be at rest if it does not changes its position continuously with respect to its surroundings with the passage of time.Eg A book lying on a table.YYou can visit Internet Padhai for more such topics and subjects.
Can a body be at rest, and in motion at the same time? If support your answer with an example.
This depends on the viewer.For eg: Imagine yourself sitting inside a moving car. A person sitting beside you would consider you to be at rest. However, a person standing outside would see you moving along with the car. To him/her you would be in a state of motion. This is what I meant by the statement, “it depends on the viewer.”To a viewer outside, you seem to be in a state of motion while to a viewer inside, you seem to be in a state of rest.So yes, this is technically possible.Now if your question was with respect to a single viewer, then no, you cannot be at rest and in motion at the same time.Therefore to summarize it all, it depends on the viewer. So the answer is yes and no.
If you are sitting in a moving car, will you be at rest or motion with respect to your friend sitting next to you?
Supposing the vehicle is in travelling in a straight line, on a level, even surface devoid of bumps, both travelers are sharing an inertial frame of reference. So in that case, the two travelers are not moving in relation to each other. Should you go up or down a hill, (assuming the road is otherwise flat (z’s rate of change doesn’t change with changes in x or y) and both seats are in the same position, then they are still at rest compared with each other.This changes should you go around a corner, as the person sitting on the outside of that corner is now travelling faster than the person on the inside of the corner. The same would be similarly true going over a bump that effects one side of the car more than the other, or if you find yourself on a bit of road with one side rises, or drops faster than the other.To be clear, accelerating in a straight line would also leave both people at rest relative to each other as well.