# ocr physics

#1
hi, when do i use each of these equations highlighted ?
thank u
https://ibb.co/SvSS5f6
0
4 weeks ago
#2
first one - when car on top of the hill or something similar.
second- a planet going around another object ie moon around earth
third - escape velocity for a planet with mass M
0
#3
(Original post by speed_bird)
first one - when car on top of the hill or something similar.
second- a planet going around another object ie moon around earth
third - escape velocity for a planet with mass M
thank you
whats the velocity for the first 2 the velocity of ?
0
4 weeks ago
#4
(Original post by hannahco)
thank you
whats the velocity for the first 2 the velocity of ?
1) velocity at whcih the vehicle loses contact with the road/ hill
2) the velocity of the object thats orbiting. in the case of the moon-earth system, it would be the velocity of the moon.
0
#5
(Original post by speed_bird)
1) velocity at whcih the vehicle loses contact with the road/ hill
2) the velocity of the object thats orbiting. in the case of the moon-earth system, it would be the velocity of the moon.
thank u so much, and is an example of the third is escape velocity for example speed a satellite travels in the earth's atmosphere before it escapes the gravitational field of the earth ?
0
4 weeks ago
#6
(Original post by hannahco)
thank u so much, and is an example of the third is escape velocity for example speed a satellite travels in the earth's atmosphere before it escapes the gravitational field of the earth ?
np. from google, escape velocity is the minimum velocity that an object should acquire to overcome the gravitational field of earth and fly to infinity without ever falling back. when i think of esc velo i usually imagine an object leaving the earths surface. but i am pretty sure ur example is correct.

check out the image on this site. the pink arrows from the satellite. so i guess u r correct. gl!
https://byjus.com/physics/escape-speed/
0
#7
(Original post by speed_bird)
np. from google, escape velocity is the minimum velocity that an object should acquire to overcome the gravitational field of earth and fly to infinity without ever falling back. when i think of esc velo i usually imagine an object leaving the earths surface. but i am pretty sure ur example is correct.

check out the image on this site. the pink arrows from the satellite. so i guess u r correct. gl!
https://byjus.com/physics/escape-speed/
thanks again !! and u too
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