The mass of object a is 10kg, and the dynamic friction function between object a and the ground is μ = 0.2 The mass of object a is 10kg. When it is placed on the horizontal ground, the dynamic friction function between object a and the ground is μ = 0.2. If it is pulled by a force with an angle of 30 ° to the horizontal, how large is F needed to produce an acceleration of 1m / S2 (G = 10m / S2)?

The mass of object a is 10kg, and the dynamic friction function between object a and the ground is μ = 0.2 The mass of object a is 10kg. When it is placed on the horizontal ground, the dynamic friction function between object a and the ground is μ = 0.2. If it is pulled by a force with an angle of 30 ° to the horizontal, how large is F needed to produce an acceleration of 1m / S2 (G = 10m / S2)?

The object is subjected to gravity mg, pulling force F (oblique upward), supporting force n (vertical upward) and sliding friction f (horizontal backward). The forces are orthogonal decomposed into horizontal and vertical directions. The horizontal direction is f * cos30 ° - F = m * a, the vertical direction is n + f * sin30 ° = mg and F = μ * n. The above three equations are combined to obtain f * C