One end of the spring is fixed at the bottom of a smooth inclined plane with an inclination angle of 37, and the other end is tied with a mass P, with the mass of m 1=4kg, where Q is a heavy object an

One end of the spring is fixed at the bottom of a smooth inclined plane with an inclination angle of 37, and the other end is tied with a mass P, with the mass of m 1=4kg, where Q is a heavy object and the mass of Q is known. (1) Let the initial compression of the spring be x0, and the overall stress is shown in the figure.

There are (m 1+m2) gsin along the inclined plane.

θ=kx0…①

Because in the initial 0.2

In s time, f is variable force, 0.2.

After s, f is a constant force, so it is 0.2.

The force of s and p on q is 0,

According to Newton's second law

Along the inclined plane: kx 1-m 1gsin.

θ=m 1a…②

Top 0.2

The distance that P and Q move up in S time is

x0-x 1=

1

2

At point 2 (3)

The simultaneous solution of formula ③ is a=3.

m/s2

(2) When P and Q start to move, the pulling force is the smallest, and there are

Fmin=(m 1+m2)a=36

ordinary

When p and q are separated, the pulling force is the largest. At this time, there is

Fmax=m2(a+gsin

θ)=72

Noun (short for noun)

Answer: (1) The acceleration of a uniformly accelerating object is 3m/s2;

(2) The maximum value of F is 72N and the minimum value is 36N. ..