An inclined plane makes an angle of 30.0º with the horizontal.

a) Find the force required to cause a 15 kg box to slide up the plane with an acceleration of 1.2 m/s2.

b) Find the force required to cause a 15 kg box to slide down the plane with an acceleration of 1.2 m/s2.

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lhabdulsamirahmed lhabdulsamirahmed · Answer 1 · 2022-01-25T10:34:58+01:00

The force required to push the box upward is 145.3N and the force to pus the box downward is -109.3N

Data given;

To move the plane upward, the box will move against gravity.

[tex]F = F - mgcos X\\ ma = F - mg cosX[/tex]

Let's solve for F

[tex]ma = F - mgcosX\\ 15*1.2 = F - 15*9.8 * cos 30\\ 18 = F - 127.30\\ F = 18 + 127.30\\ F = 145.3N[/tex]

When the force pushes the box down the inclined plane, it moves towards gravity.

[tex]F = F + mgcosX\\ ma = F + mgcosX\\ 15*1.2 = F + 15*9.8*cos30\\ F = -109.3N[/tex]

The force required to push the box upward is 145.3N and the force required to push the box downward is -109.3N

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