The net x-force on a 1-kg oscillating object moving along the x axis is Fx = −b(x − a2x3), where b = 123 and a = 4 in the appropriate SI units. (a) What are the units of a and b? Unit of a is_____ (Choose one) (1/m , m, N*m, 1/N, N/m , N) Unit of b is ____ (choose one) (m/N, N, N/M, 1/m, 1/N, m, N*m) For small oscillations, the force law reduces to the harmonic oscillator law F x ≈≈−k sx, where ks depends on the value of a and/or b. (b) What is the frequency of such small oscillations?( Round the answer to two decimal places.) The frequency is _______Hz. (c) How small is "small"? For what range of x will Fx be within 1% of −ksx ? ________ cm
Simple harmonic motion
Simple harmonic motion is a type of periodic motion in which an object undergoes oscillatory motion. The restoring force exerted by the object exhibiting SHM is proportional to the displacement from the equilibrium position. The force is directed towards the mean position. We see many examples of SHM around us, common ones are the motion of a pendulum, spring and vibration of strings in musical instruments, and so on.
Simple Pendulum
A simple pendulum comprises a heavy mass (called bob) attached to one end of the weightless and flexible string.
Oscillation
In Physics, oscillation means a repetitive motion that happens in a variation with respect to time. There is usually a central value, where the object would be at rest. Additionally, there are two or more positions between which the repetitive motion takes place. In mathematics, oscillations can also be described as vibrations. The most common examples of oscillation that is seen in daily lives include the alternating current (AC) or the motion of a moving pendulum.
The net x-force on a 1-kg oscillating object moving along the x axis is Fx = −b(x − a2x3), where b = 123 and a = 4 in the appropriate SI units.
(a) What are the units of a and b?
Unit of a is_____ (Choose one) (1/m , m, N*m, 1/N, N/m , N)
Unit of b is ____ (choose one) (m/N, N, N/M, 1/m, 1/N, m, N*m)
For small oscillations, the force law reduces to the harmonic oscillator law F x ≈≈−k sx, where ks depends on the value of a and/or b.
(b) What is the frequency of such small oscillations?( Round the answer to two decimal places.)
The frequency is _______Hz.
(c) How small is "small"? For what range of x will Fx be within 1% of −ksx ?
________ cm
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