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mistalin

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## Homework Statement

A block lies on an inclined plane with an angle of elevation theta. The inclined plane is frictionless, and the plane is accelerated to the left such that the block's height remains constant. What is the net force on the block?

I'm having trouble figuring out how to draw the correct force diagram for this. When you decompose both gravity and the force from the moving plane, is there ever a force up the ramp that balances out of the force down the ramp due to gravity?

mass, acceleration of inclined plane, theta

the answer is in terms of these variables

## Homework Equations

F = ma

Fblock = mg

Fparallel = mgsintheta

Fperpendicular = mgcostheta

## The Attempt at a Solution

I know that the force of gravity needs to be balanced out but an upward force. But I don't know where is should be coming from. The only two forces here are gravity and force from the inclined plane.

Thanks for the help,

mistalin

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