If you were in the middle of a frozen pond explain how will you get off the pond without making the use of any exernal help
2 answers
I'd walk to shore on the ice.
Walking is an external force though.
If you were on a chunk of ice in the middle there are two ways
1) blowing
2) throwing an object to a direction which is not perpendicular to the plane of the lake
1)by blowing you makes the velocity of a mass of air increase
if there's change of velocity that means there is an acceleration .
for there to be an acceleration you need to exert a force.
so what you do by blowing is to exert a force on air.
so according to Newton 's 3rd law a reaction force with the same magnitude and opposite direction is exerted on you this force makes you accelerate to specific velocity.
but this velocity would very tiny because the force that's need to make a small acceleration on a small mass of air is tiny.you would have to wait a long time for to get out of the lake.
2) more sensible way to throw your both shoes or some other object you have. For highest velocity you have to throw them parallel to the lake's plane and if you throw them perpendicularly nothing would happen. And this could be explained as I explained the 1st.
I only used accelerations and F=ma for this explanation
If you were on a chunk of ice in the middle there are two ways
1) blowing
2) throwing an object to a direction which is not perpendicular to the plane of the lake
1)by blowing you makes the velocity of a mass of air increase
if there's change of velocity that means there is an acceleration .
for there to be an acceleration you need to exert a force.
so what you do by blowing is to exert a force on air.
so according to Newton 's 3rd law a reaction force with the same magnitude and opposite direction is exerted on you this force makes you accelerate to specific velocity.
but this velocity would very tiny because the force that's need to make a small acceleration on a small mass of air is tiny.you would have to wait a long time for to get out of the lake.
2) more sensible way to throw your both shoes or some other object you have. For highest velocity you have to throw them parallel to the lake's plane and if you throw them perpendicularly nothing would happen. And this could be explained as I explained the 1st.
I only used accelerations and F=ma for this explanation
1 answer