The driver of a car traveling at 65.0 mph suddenly hits his brakes on a horizont

Question

The driver of a car traveling at 65.0 mph suddenly hits his brakes on a horizontal highway. (Note: Draw the force vectors with their tails at the dot. The exact lengths of the vectors are not important but the orientation is.)
1) Make a free-body diagram of the car while it is slowing down. Show the friction force, weight, and normal force: 1) Make a free-body diagram of the car while it is slowing down. Show the friction force, weight, and normal force: 2) Make a free-body diagram of a passenger in a car that is accelerating on a freeway entrance ramp. Show the weight, normal force, and the P vector:

Links: *http://imgur.com/C4lxG.jpg
*http://imgur.com/lHywm.jpg

Explanation / Answer

(a) For this FBD, you only need to draw
1. the frictional force that is acting to the left,
2. the weight of the car acting vertically downwards,
3. and its normal force acting vertically upwards.


(b) Since the car is on the ramp, then the situation is different. I do not see a ramp in your picture, but if there is indeed a ramp,
1. the weight of the car acting vertically downwards,
2. the normal force that is upwards and perpendicular to the ramp (remember; now the weight and normal force are not parallel to each other; they are in different orientations!)
3. and the accelerating force that is acting parallel to the ramp.

IF there is no ramp included, and the car is drawn as it is shown above, then, 1. the weight of the car acting vertically downwards, 2. the normal force that is acting vertically upwards, 3. the accelerating force that is acting to the right.

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