# Newton Second Law of Motion and the Atwood’s Machine

Topics: Mass, Force, Classical mechanics Pages: 2 (349 words) Published: September 30, 2012
Experiment # 9

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Newton 2nd Law of Motion and The Atwood’s Machine

Submitted to: Prof. Michelle Concepcion

Submitted by: Arnold Jr. S. Cruz

Discussion:

The results of this lab reflect on the different kind of elevators. The mass is constant as if your not doing anything to change it. We feel heavy in a elevator because the accelerator is going up with an acceleration and not when it is going up with uniform speed. That is due to the force that we may experience from the floor of the elevator on our feet.

Law of Acceleration

- The acceleration a of a body is parallel and directly proportional to the net force F acting on the body, is in the direction of the net force, and is inversely proportional to the mass m of the body, i.e., F = ma.

The Atwood Machine

- is a device where two masses, M and m, are connected by a string passing over a pulley.

Theory

- the atwood machine was invented in 1784 by Rev. George Atwood as a laboratory experiment to verify Newton’s laws of motion. The ideal atwood machine consists of two masses m1 and m2, connected by an inelastic massless string over an ideal massless pulley

- when m1=m2, the machine is in neutral equilibrium regardless of the position of the weights.

- When m2>m1 both masses will experience uniform acceleration.

(http://en.wikipedia.org/wiki/Atwood_machine)

Conclusion:

The goal of this experiment was to determine the acceleration due to

gravity on earth. We assumed that our result would be 9.8m/s^2, because

that is accepted for the value of g.

I therefore conclude that, the friction between string and pulley is

there when masses are added to m2, the system still remains balanced. To

determine the proper amount of friction in terms of added masses, one

should add a small amount of mass to m2 until the system...