You are in your favorite elevator, coming to a stop as you go from the ground...
You are in your favorite elevator, coming to a stop as you go from the ground floor to the 4th floor.
a) What forces are acting on you as you are coming to a
stop in the elevator?
Normal force upward and Force of gravity upward
Normal force downward and Force of gravity upward
Normal force downward and Force of gravity downward
Normal force upward and Force of gravity downward
Just the Force of gravity downward
b) As you are coming to a stop, are you accelerating and
if so, which way are you accelerating?
No, there is no acceleration
Yes, accelerating downward
Yes, accelerating upward
c) As you are coming to a stop, what is the direction of
the net force acting on you?
Downward, since the velocity points down.
Upward, since the velocity points up.
Downward, since the acceleration points down.
The net force is zero, so it has no direction.
Upward, since the acceleration points up.
d) What is the correct expression for Newton's 2nd Law
in the y-direction? Use "upward" for the positive
y-direction.
|Fg| = m
ay
−|FN| −
|Fg| = m
ay
|FN| −
|Fg| = m
ay
|FN| +
|Fg| = m
ay
|FN| +
|Fg| = 0
e) As you are coming to a stop going from the ground
floor to the 4th floor, how does the size of the Normal force on
you compare with the size of your weight?
|FN| = mg
|FN| > mg, but not
zero
Impossible to tell without knowing your acceleration.
|FN| < mg
|FN| = 0
Homework Answers
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