(1) If a car stops suddenly, you feel \"thrown forward.\" We\'d like to understa
ID: 1880258 • Letter: #
Question
(1) If a car stops suddenly, you feel "thrown forward." We'd like to 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 for you to hold onto. a. Draw a picture and identify all of the forces acting on you as the car travels at a perfectly steady speed on level ground. b. Draw your free-body diagram. Is there a net force on you c. Repeat parts a and b with the car slowing down. d. Describe what happen e. Use Newton's laws to explain why you seem to be really a force pushing you forward? f. Suppose now that the bench is not slippery. As the car slows down, you stay on the bench and don't slide off. What force is responsible for your force point? Include a free-body diagram as part of your answer? ? If so, in which direction? s to you as the car slows down. "thrown forward" as the car stops. Is there deceleration? In which direction does thisExplanation / Answer
a) Gravity acts downward on you, the normal force due to the seat and floor on which you are sitting act upwards on you.
b) There is No net force on you as the car is running at constant speed, 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 because of your inertia.
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 you and the seat holds you to the seat and stops you from moving forward. If the coefficient of friction is not large enough or if the acceleration is 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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