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The problem of physical spring vibrator in senior two! Ask the great god to answer!
When the vibrator stops moving, the total force of the vibrator should be 0. There are two situations.

1. In the equilibrium position.

2. When elastic force = friction force

kx=μmg=0.2* 1. 10=2

X=0.02, if the oscillator speed is exactly 0 at this time,

When the first one reaches the left,

S = kx * x/2μ g =100 * 72 *10 (-4 square) /2*0.2* 10= 12.25 (cm).

12.25-7=5.25

When the vibrator moves 5.25cm to the left of the equilibrium position, the speed is zero and the elastic force is greater than the friction force, so the vibrator will move to the right.