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I have a block resting on an inclined plane. The angle of the incline is 30 degr

ID: 2221844 • Letter: I

Question

I have a block resting on an inclined plane. The angle of the incline is 30 degrees (with respect to the ground). The coefficient of static friction between the incline and the block is 0.8. The coefficient of kinetic friction between the incline and the block is 0.5. The block has a mass of 1 kg.

If I push on the block in the direction downward along the incline, what is the maximum force that I can exert before it starts moving downward?
answers are

1.89 Newtons
11.69 Newtons
4.57 Newtons
12.41 Newtons
6.79 Newtons
3.92 Newtons

second part.
If the force were applied in the upward direction instead of the downward direction, would the maximum value be larger, small, or the same?

Explanation / Answer

first part:

1.89 Newtons

second part:

larger