brianrodriguez2005
31.07.2021 •
Physics
Recall that a Rube Goldberg device is a series of events that performs a simple task. For this performance task
you will design a Rube Goldberg device to show the transfer of energy from step to step.
The device must include:
At least 5 steps.
At least 3 different simple machines.
A conversion of potential energy into kinetic energy.
A conversion of kinetic energy into potential energy.
A conversion of gravitational potential energy into kinetic energy.
A neat and colored drawing of your device that includes numbers for each step.
A description of each step of your device, including what type of energy transfer occurred, and how this
occurred.
A description of what simple task your device is supposed to accomplish.
Citations from sources.
PLEASE SOMEONE HELP ME IM BEGGING YOU
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Ответ:
Consult the attached free body diagram. The only forces doing work on the wagon are the frictional force opposing the wagon's motion and the horizontal component of the applied force.
By Newton's second law, the net vertical force is
• ∑ F [v] = n + (80.0 N) sin(30.0°) - mg = 0
where a is the acceleration of the wagon.
Solve for n (the magnitude of the normal force) :
n = (10.0 kg) g - (80.0 N) sin(30.0°) = 58.0 N
Then
f = 0.500 (58.0 N) = 29.0 N
Meanwhile, the horizontal component of the applied force has magnitude
(80.0 N) cos(30.0°) ≈ 69.3 N
Now calculate the work done by either force.
• friction: -(29.0 N) (10.0 m) = -290. J
• pull: (69.3 N) (10.0 m) = 693 J