if a car stops suddenly, you feel \"thrown forward\". We\'d liketo understand wh
ID: 3893407 • Letter: I
Question
if a car stops suddenly, you feel "thrown forward". We'd liketo understand what happens to the passengers as a car stops.imagine yourself sitting on a very slippery bench inside a car.This bench has no friction, no seat back, and there's nothing foryou to hold to. Q1: Part A: identify all of the forces action on you as thecar travels at a perfectly steady speed on level ground. Part C: repeat part A with the car slowing down Part D: describe what happens to you as the car slowsdown Part E: suppose now that the bench is not slippery. as the carslows down, you stay on the bench and dont slide off. what force isresponsible for you deceleration? Part G: in chich directin does this froce point? if a car stops suddenly, you feel "thrown forward". We'd liketo understand what happens to the passengers as a car stops.imagine yourself sitting on a very slippery bench inside a car.This bench has no friction, no seat back, and there's nothing foryou to hold to. Q1: Part A: identify all of the forces action on you as thecar travels at a perfectly steady speed on level ground. Part C: repeat part A with the car slowing down Part D: describe what happens to you as the car slowsdown Part E: suppose now that the bench is not slippery. as the carslows down, you stay on the bench and dont slide off. what force isresponsible for you deceleration? Part G: in chich directin does this froce point?Explanation / Answer
a) Gravity acts downward on you, the seat (on your butt) and floor (on your feet) act upwards on you.
b) No net force on you, you are not accelerating in any direction.
c) The forces are the same, as long as you're still on the seat.
d) You continue to travel forward with the same speed you had before the car started slowing. You're heading for the dashboard.
e) First law: objects in motion stay in motion unless a force acts on them. You keep moving, the car stops, you actually run into the car. It feels like you're thrown but that is because of your frame of reference.
f) Friction force between your butt and the seat holds you to the seat and stops you from moving forward. If the coefficient of friction is not large enough or acceleration too high, you may still be thrown forward.
g) The force points in the direction opposite to the direction you are traveling.
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