Thread: Physics Quiz 12
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Unread 03-03-2016, 18:11
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Ether Ether is offline
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Re: Physics Quiz 12

Quote:
Originally Posted by Rachel Lim View Post
Assumptions / notes for part 1:
- The only thing that matters is the gravity component parallel to the ramp, and the tension force parallel to the ramp.

This is the first necessary insight.


Quote:
- The cart moves as a single body along the ramp (it doesn't matter which part of the ramp the rope is attached to)
I think you meant the rail, the cable, and the bucket?

Quote:
- The 0.5 m/s is irrelevant, what does matter is that it's moving at a constant velocity (i.e. acceleration = net force = 0)
Correct. This is the second necessary insight.

The 0.5 m/s was indeed a red herring. Part of solving physics problems is eliminating irrelevant information.


Quote:
Part 1:
F_gravity = F_tension
m*g*sin(20deg) = T cos(12deg)
T = 5448 N
Correct!




Last edited by Ether : 04-03-2016 at 11:47.
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