Is this an example of a pair of forces from Newton's Third Law?
2007-04-17 06:30:25 · 6 answers · asked by Wendy D 1 in Science & Mathematics ➔ Physics
Yes, it is an example of a pair of opposing forces. However, you are forgetting that the force between the horse and cart is not the only force in the system. The system is able to move because of the action of friction as the horse pushes against the ground. On a frictionless surface, the horse and cart wouldn't be able to go anywhere unless something external pushed them.
2007-04-17 06:34:38 · answer #1 · answered by DavidK93 7 · 1⤊ 0⤋
Horse Pulling Cart
2016-11-13 23:15:57 · answer #2 · answered by marci 4 · 0⤊ 0⤋
i can't quite remember the numbers of the Newton laws, but if you're talking of action - reaction, then you should know that movement appears in any unstable system, until an equilibrium is reached.
if you analyze the "earth - horse - cart" system, you'll see that you are missing some forces in your equation. like the force that opposes to the movement of the cart, which is calculated by multiplying the friction coefficient with the normal force, that is the opposite of the cart's weight. if that force is big enough the cart won't move. since the cart is supposed to be on wheels the roll friction between the wheel and the ground is very small, then the force that actually opposes to the cart's movement is the friction in it's bearings, which can be calculated if you determine the contact area between the bearings and the axles. and so forth.
so, you see, things are not that simple in the real world. think more before taking in account simple hypotheses that, even if they are not completely wrong, might still be insufficient.
the best example of a pair of forces is you standing on the ground. the earth pulls you with the force of gravity (weight) and pushes you at the same time through the pressure that it exerts on your feet.
2007-04-17 07:02:55 · answer #3 · answered by ╠╬╣ 3 · 0⤊ 0⤋
If the cart has wheel and the ground is pulling back on the cart at less force than either is exerting on each other, they will move.
2007-04-17 06:37:13 · answer #4 · answered by Gene 7 · 0⤊ 0⤋
the cart and horse are exerting a force on each other, but the horse is exerting its force to the ground through force of friction, while the cart pulls directly opn the horse
2007-04-17 07:23:26 · answer #5 · answered by Gino R 2 · 0⤊ 0⤋
pulling force is more than resistance force of cart hence cart move in the direction of horse pulling.
2007-04-17 06:44:42 · answer #6 · answered by shabbir s 3 · 0⤊ 0⤋