Experiment
10
Experiment
Problem
for Statics
Piano Lifter: You
are asked to
develop a beam system that can lift a piano so that your mate
can clean under
it. You decide to use a system, such as shown below in (a). To
develop your expertise,
you first experiment with a miniature version. You are to
decide with the
miniature version, shown in (b), the minimum weight of the
hanging object(M2) in order to
lift the "piano"enough
so that a paper can be slid under the piano. If you finish
this task with time
to spare, estimate the weight of the hanging object that will
hold the beam in
a horizontal orientation.
(5 points
Bonus!)
You
will be
provided with M1, and any lengths you find necessary.
Instructor Guidelines: Each group must do
the following in this
order:
1.
(3
pts) Draw a Free Body Diagram
(FBD) for the meter
stick and get it checked by the instructor. If it is not
correct, instructor will
mark off a point and give you a hint.
After two unsuccessful attempts, the instructor will
give you the
correct answer and you will be allowed to go to step 2.
2. (3 Pts) Write
equations for the sum the forces on the meter stick in
both x and y directions and them checked by the instructor. If they are not
correct, the instructor
will mark off a point and give you a hint.
After two unsuccessful attempts the instructor will
give you the answer
and you will be allowed to go to step 3.
3. (3 Pts) Select the
zero mark on the meter stick as the pivot and write an
equation for the sum of
the torques on the meter stick about this point. This must be
checked by the instructor.
If it is wrong, a point will be marked off and a hint
given. After two
unsuccessful attempts the
answer will be given and you will be allowed to proceed to
step 4.
4. (3 Pts) Solve
the system of equations formed above for M2 in terms
of measured quantities. If
it is
wrong, a point will be marked off and a hint given. After two
unsuccessful attempts the
answer will be given and you will be allowed to proceed to
step 5.
5. (3 Pts) Lab write
up.
Equipment List:
Meter
stick
for
beam
Three
right angle clamps
Two
long rods (-80 cm)
Short
thin rod that is pivot for beam
Pulley
at end of rod
String
Meter
stick
500-g
object (the piano)
Standard
masses and holder to hang from sting (200, 100, 50, 20, 20,
10, 5, 2, 2, 1 g)
