I am trying to find acceleration in a Lab assignment I am working on. In the lab

Question

I am trying to find acceleration in a Lab assignment I am working on. In the lab instructions my professor tells us the following regarding finding the acceleration:

"Newton's second law tells us that the acceleration, a, of the block down the plane (assuming that it is moving on an inclined plane) is a=g(sin*angle - ukcos*angle).

"Here, the angle is the inclination angle of the plane with respect to horizontal, uk is the coefficient of kinetic friction, and g is the acceleration due to gravity."

My angle is 29.1. The block is wood and so is the plane so my coefficient of kinetic friction would be 0.3.

I am getting a negative acceleration. What am I doing wrong?

Explanation / Answer

a=g(sin*angle - ukcos*angle)

a = 9.81(sin(29.1) - 0.3*cos(29.1))

a = 1.688 m/s^2

may be you are not considering uk

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