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Functional Health Pattern

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Static Equilibrium

PRE LAB QUESTIONS

What conditions must be satisfied for a rigid object to be in total equilibrium?

2) Why is the advantage of having a doorknob located farthest away from the hinges? Explain

3) Show that the SI unit for torque and energy are the same. Can we then say that torque is energy? Explain.

4) If you see a rigid object rotating, does this mean that there must be a net torque acting on it? Explain.

5) Can an object be in equilibrium if it is in motion? Explain

OBJECTIVE

The purpose of this experiment is to study the conditions that must be satisfied for a rigid object to be in total equilibrium. This is done by computing the total torque acting on a meter stick by means of weights suspended at specific locations on the ruler.

MATERIALS

Meter stick Support stand
Knife edge clamp Weight hangers
Slotted weights Unknown weight
Triple beam balance

[pic]
INTRODUCTION
The torque τ exerted by a force F on a rigid object able to rotate about an axis is given as τ = F d where d is the lever or moment arm of F about axis. It is equal to the perpendicular distance from axis to F. Torque is a vector quantity that is perpendicular to the plane made by F and d. For rigid bodies in equilibrium, they should not have neither linear nor angular acceleration.
This means that two conditions must be satisfied simultaneously; the total force acting on the object is zero and the total torque should also be zero. Hence Σ τ = 0 (1) and Σ F = 0

By convention, the torque is positive if the force tends to rotate the object counterclockwise and negative if it ends to rotate clockwise.
The apparatus consists of a meter stick balanced about a pivot. The torques are created by weights hung at different locations along the ruler by means of clamps.

EXPERIMENTAL PROCEDURES

Using the triple beam balance, measure the mass of the meter stick without any clamp and record it.

2) Find an average value of the mass of each clamp you are using in your experiment.

3) Ideally, the center of gravity of the stick should be at the 50 cm mark. However this is not true in most situations. To find its correct location, use one clamp to balance the stick about the stand until it is horizontal. Record this position of the center of gravity.

Hang a 100-g weight from a clamp located at the 10 cm mark and slide the meter stick through the supporting clamp until the stick is balanced on the support stand. Record the position of the point of support.

Keeping everything as in procedure 4, add a 200-g from a clamp located at the 90 cm mark and slide the meter stick until it is balanced on the support stand. Record the new position of the point of support.

Remove the weights and clamps. Balance the meter stick at its center of gravity as in procedure 3 and hang an unknown mass ( i.e your keys) at the 90 cm mark. Place the 200-g mass on the meter stick at a location until equilibrium is reached. Record this position.

REPORT FORM

True mass of meter stick ____________ Mass of a clamp ______________

Center of mass of meter stick ___________ True weight of unknown mass _________

Procedure 4
Position of the 100-g mass __________
Position of equilibrium _________
Mass of the stick from method of torques _____________

Procedure 5
Position of the 200-g mass _________
Position of equilibrium _________

Procedure 6
Position of the 200-g mass _____________
Position of unknown mass ______________
Weight of unknown mass from method of torques ____________
CALCULATIONS

From procedure 4, compute the mass of the meter stick by the method of torques. Find the percent error between the computed and the actual mass of the meter stick.

In procedure 5, choose an appropriate axis of rotation and compute the torque for each force acting on the stick. Since the object is in equilibrium, ascertain that the sum of the torques is zero.

From procedure 6, compute the weight of the unknown mass by the method of torques. Find the percent error between the computed and the actual mass of the meter stick.

POST LAB QUESTIONS

What are the sources of error in this experiment?

Can the ruler be in equilibrium while the weights hung from it are on one side of the axis?
Explain using equation ( 1 ).

What is the advantage of having the stick clamped at its center of gravity in procedure 6?

In procedure 4, why is the force exerted by the stand on the stick irrelevant in your calculation?

What is your conclusion from this experiment?

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