Newton's Law Problem, involves n-t frame or r-t frame

In summary, the conversation discusses finding the magnitude of a train's acceleration at different time intervals while traveling on a circular and straight path. The use of normal and tangential acceleration is mentioned, as well as the importance of determining the train's distance traveled along the track. The question of using the 60 degrees angle to find the arc length of the circle is also raised.
  • #1
jlopez
3
0
After picking up passengers, a train accelerates uniformly until its speed is 100 km/hr at t= 300 s. If during this time it is traveling on a planar path that approximates the circle and line shown in the figure, find the magnitude of the train's acceleration when (a) t = 1 min and (b) t = 2 min.

link to figure:
http://i22.photobucket.com/albums/b346/lopezjose/IMG00264-20100502-0017.jpg

I'm not sure what frame of reference to use and how to start this problem

normal acceleration is v^2/r
tangental acceleration is ds/dt
 
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  • #2
Find out how far the train traveled along the tracks after 1 and 2 minutes.
If the train is still on the circular part of the track, then you have to combine the tangential and the normal acceleration. If it's on the straight track, there's only the accelaration along the track.
 
  • #3
do i use the 60 degrees to find the arc length of the circle?
 

1. What is Newton's Law Problem?

Newton's Law Problem is a physics problem that deals with the application of Newton's laws of motion to solve a given scenario. It involves using mathematical equations to analyze the motion of objects in a specific frame of reference.

2. What is an n-t frame?

An n-t frame, also known as an inertial frame, is a reference frame that is not accelerating and is at rest or moving with a constant velocity. It is used to observe and measure the motion of objects according to Newton's laws of motion.

3. What is an r-t frame?

An r-t frame, also known as a relative frame, is a reference frame that is moving with respect to an n-t frame. It is used to observe and measure the relative motion of objects in comparison to the n-t frame.

4. How do you solve a Newton's Law Problem involving n-t frame?

To solve a Newton's Law Problem involving n-t frame, you first need to identify the forces acting on the object and their direction. Then, use Newton's Second Law (F=ma) to calculate the net force and acceleration of the object. Finally, use kinematic equations to determine the position, velocity, and time of the object.

5. How do you solve a Newton's Law Problem involving r-t frame?

To solve a Newton's Law Problem involving r-t frame, you need to use the concept of relative motion. This involves breaking down the motion of the object into components in the n-t frame and the r-t frame. Then, use the equations of motion in each frame to calculate the position, velocity, and acceleration of the object.

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