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michaelw
- 80
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Im very confused as to why..
The law of inertia states that a body will continue moving in a straight line with constant speed unless a force is imposed on it. No force is needed to make the car "want" to go straight.michaelw said:also, take a look at this picture
http://www.joma.org/images/cms_upload/banked_unbanked_roadway47540.gif
it seems in both cases, there is no force shown that makes the car want to go straight (but according to inertia, the car will want to go straight)..
In the first picture, the centripetal force is provided by friction; in the second, the centripetal force is provided by the horizontal components of friction and the normal force.in the first, there is static friction (centripital force) that acts to move the car to the left, in the second there's both centripital force as well as gravity..
In order to turn to the left, the car must centripetally accelerate. (It's turning in a circle.) And that requires a force. (No force and the car would keep going straight.)but what is the force that is countering the forces to the left? why are forces to the left even required, if (according to the diagram) there's no force to the right (or straight).. if there is a force, what is its magnitude?
The force of friction you are referring to is the force of traction: the car tires pushing back on the road. The force of the traction is in the direction of motion of the car. It does no work on the car so it causes no energy to be lost. It doesn't slow the car down or resist its motion.michaelw said:Im very confused as to why..
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