physic problem.. help me please..?

Question

You push a heavy car by hand. The car, in turn, pushes back with an opposite but equal force. The car did not move. Does this mean the forces cancel one another making acceleration impossible or equivalent to zero? Why or Why not?

Answer 1

While you apply a force to the car, it applies a force back on YOU. Since the forces act on different objects (one force acts on the car, the other acts on you), they dont cancel out, so acceleration is possible.



The car probably did not move because you did not apply a large enough force to overcome the static friction.

Answer 2

No, -it doesn't mean that. -In order to make the car BEGIN to move, a force of at least a certain minimum level is required, and your pushing simply didn't reach that minimum level. This level is that required to overcome the static friction.



Once you've reached that level and have overcome the static friction, then Newton's Laws apply, and the car will begin to accelerate (although slowly!) until the retarding forces equal the pushing force. When that happens, the car will roll at a constant velocity, until you stop pushing, when it will decelerate and finally stop again.

Answer 3

Not necessarily. What you're trying to imply here is like the classic problem of the horse (Newton's Third Law). The forces act in different directions. Hence, acceleration is possible. Actually, if you try to push the car and it doesn't move, it means the force was not enough.

Answer 4

This probably won't help and not at all what you mean but if your doing physics i find these suggestions help.



forces is a funny subject and several answers are possible

1. take the hand brake off

2. try not pushing it up the hill cos you got yourself the extra force of gravity working against you try pushing it the other way.

and finally my third whether or not the car doesn't seem to be moving it actually is. does the world not rotate? of course it does so therefore the car is moving plus the world is steadily accelerating is it not?

Answer 5

no, in that case, it's not only about the force cancels one another. it could mean the force you give to the car (F) isn't big enough. F should be greater than (m.g) of the car + Friction force of the car...

F < m.g car + Fs

F = m.g car + Fs

if you make it like this:

F > m.g car + F kinetic

it would create an acceleration.

sorry for messed up sentences >.< hope this helps!

Answer 6

ALL THE PUSHING YOU DID AND THE CAR DID NOT MOVE MEANS YOU DID NOT WORK REGARDLESS OF HOW YOU FEEL SO YES THE FORCES CANCELS EACH OTHER

Answer 7

the galaxies rotate at speeds inconsistent with their obvious mass is considering we do see it all. I am relating to it as being the theoretical Dark Matter. There are very powerful proofs that suggests that darkish topic exist. One the is the inconsistent velocity of and obvious mass. darkish topic makes up approximately seventy five% to eighty% of the problem within the Universe...

Answer 8

i dont know but if you go on yahoo answers the nice people on there can help