- #1
gladwarez
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Hello, I am a junior in high school now taking AP Physics B. I'm stuck on a series of questions regarding force:
1. Assume you are on a planet similar to Earth where the acceleration of gravity is 10m/s^2 and the positive directions for displacement velocity and acceleration are upward. At t=0sec., an elevator is at a displacement of x=0 with a velocity of v=0m/s. A student whose weight is 400N stands on a scale in an elevator and records the scale reading as a function of time. The data is shown below:
0-5s--------400N
5-10s-------500N
10-15s------600N
15-20s-----0N
a) Which direction is the force due to the scale?
b) What is the mass of the student?
c) Calculate the acceleration of the elevator during the 15-20s interval.
d) Draw the a vs. t graph.
e) What is the velocity of the elevator at t=20s?
f) Draw the v vs. t graph.
g) What is the displacement of the elevator above the starting point at the end of 20s?
h) Draw the d vs. t graph.
I was only completely sure about a and b, for a the direction is up and for b the mass is 40kg. I obviously don't want just answers, but steps and hopefully explanations to go along with it.
Thank you.
1. Assume you are on a planet similar to Earth where the acceleration of gravity is 10m/s^2 and the positive directions for displacement velocity and acceleration are upward. At t=0sec., an elevator is at a displacement of x=0 with a velocity of v=0m/s. A student whose weight is 400N stands on a scale in an elevator and records the scale reading as a function of time. The data is shown below:
0-5s--------400N
5-10s-------500N
10-15s------600N
15-20s-----0N
a) Which direction is the force due to the scale?
b) What is the mass of the student?
c) Calculate the acceleration of the elevator during the 15-20s interval.
d) Draw the a vs. t graph.
e) What is the velocity of the elevator at t=20s?
f) Draw the v vs. t graph.
g) What is the displacement of the elevator above the starting point at the end of 20s?
h) Draw the d vs. t graph.
I was only completely sure about a and b, for a the direction is up and for b the mass is 40kg. I obviously don't want just answers, but steps and hopefully explanations to go along with it.
Thank you.