Uniform Circular Motion Lab (Module 6)
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Uniform Circular Motion Lab Assignment (Module 6)
Data-Tables and Graphs:
9
14
19
24
29
34
39
3500
4500
5500
6500
7500
8500
9500
10500
11500
12500
f(x) = 295.66 x + 794.13
R² = 1
Measurement of Bob Mass
centripetal acceleration m/s2
Applied Force (mN)
Free-Body Diagrams:
Post-Lab Questions:
1.
To get a feeling for inertial forces discuss the familiar cases of accelerating in a car in a straight line while increasing or decreasing speed and turning the wheel to change direction. What direction do you feel a force in these scenarios and how does the strength
of that force change if you either hit gas/brake harder or turn sharper?
If the car is speeding up you will feel a force in the opposite direction of the motion of the car. However, if the car is in the process of decelerating, you will feel a force in the same direction as the motion of the car as your body will want to continue to travel in a forward direction. When you turn the wheel of the car you will feel a force pushing outward as your turn the wheel since your body will have a desire to stay in the path that it was previously in according to Newton’s First Law of Motion. If you hit the gas or brake harder or turn sharper this magnifies the force felt and makes it stronger and more
exaggerated as your body is continues to go in that direction tangent to the path in which the car is moving.
2.
From the bob’s frame while it is in uniform circular motion what is the direction and magnitude of the inertial force it feels?
The direction of the inertial force is opposite of that of the centripetal force that is acting on the frame of the bob. On the other hand, the magnitude is the exact same as the magnitude of the centripetal force.
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C
Dynamic Analysis and Aeroelasticity
SECTION B
Answer TWO questions from this section
ENG2012-N
The moment of inertia of a helicopter's rotor is 320kg. m². The rotor starts from rest
and at t = 0, the pilot begins by advancing the throttle so that the torque exerted on
the rotor by the engine (in N.m) is modelled by as a function of time (in seconds) by
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R20
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