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- Dec 27, 2012
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Hey guys,
If a block at rest was pushed to the right by an external force on a surface with kinetic friction, I know that the horizontal component is to the right and the friction opposes this motion, which points to the left based on Newton's third law. What if you have a car that was moving to the right, what is the direction of the horizontal and friction forces?
I am confused because in a moving car, it uses internal forces to provide its motion where its wheels pushes against the surface and consequently frictional force of the road pushes back onto the car, thus causing it to move right. So shouldn't the horizontal component point to the left and friction point to the right? Also as a follow-up question, what happens to the direction of the forces if the car where to then apply the breaks?
If a block at rest was pushed to the right by an external force on a surface with kinetic friction, I know that the horizontal component is to the right and the friction opposes this motion, which points to the left based on Newton's third law. What if you have a car that was moving to the right, what is the direction of the horizontal and friction forces?
I am confused because in a moving car, it uses internal forces to provide its motion where its wheels pushes against the surface and consequently frictional force of the road pushes back onto the car, thus causing it to move right. So shouldn't the horizontal component point to the left and friction point to the right? Also as a follow-up question, what happens to the direction of the forces if the car where to then apply the breaks?