Question

PHYSICS HELP>:

Answer 1

but this is math section :(

Answer 2

but the physisc section is dead :(

Answer 3

but you can tag some people :(

Answer 4

How do I know they know it? :(

Answer 5

hey tag some people did you see some people not me
best of luck !!!

Answer 6

F =20-10 =10N

Answer 7

wait, so the object/mass weasn't moving? it says it has a velocity, it stays contant but it still moves.

Answer 8

it is either not moving or moving with a constant velocity. In this case, it is moving with a constant velocity.

Answer 9

that is the first law of Newton http://csep10.phys.utk.edu/astr161/lect/history/newton3laws.html

Answer 10

how can it be NOT moving at a constant velocity?

Answer 11

hey, reread, I said : "it is either not moving OR....."

Answer 12

ooh sorry

Answer 13

ok but wouldn't the forces prevent the object from moving?

Answer 14

That is reality and it is called friction forces. In theory, it is ignored

Answer 15

ooh, I am sorry, but I am a bit confused :'( would you mind explaining to be what is going on in the picture? I see a mass that is supposedly moving at 5 m/s constant speed and there are forces being applied?

Answer 16

they just say the mass is moving and but they don't say that the force apply on the mass on which direction. How can you know which direction it is moving? if I say it is toward to the East, then the ? force is < 10 so that it can move to the East ( because 20 > 10 + amount of force <10)

Answer 17

But if I say it is moving to the West, then the ? force must be >10 so that the total force to the West > the force from the East which is 20

Answer 18

Hence, we don't know about the direction.

Answer 19

Therefore, only it is moving in constant velocity. That is applying the first law of Newton, the forces apply on the mass = 0 and it is originally moving with a constant velocity

Answer 20

On that way, you can calculate the required force by Newton's law. Dat sit

Answer 21

ooooh I see now ^_^

Answer 22

thank you.

Answer 23

yw