- #1
awelex
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Hi,
this seems to be an easy enough problem, but for some reason I'm having problems with it.
A block slides down an inclined plane, and the inclined plane slides horizontally. There is friction at the incline's upper surface, but not at its lower surface. For each body, draw a free body diagram.
- none, we only need to draw the free body diagram
I have already identified the usual suspects:
Forces on plane:
- the force of gravity, acting downwards
- the normal force, acting upwards
- Additionally, I know that the plane is sliding along a level floor. Because there is no friction (stated in the problem), there is no force resisting the motion, and, assuming that it slides at a constant velocity, that means that there is no horizontal force acting on it at all (because the horizontal component of the net force must be zero)
- the weight of the block also acts on the plane, so we have another force acting downwards here.
Here comes the tricky part: I'm not really sure what makes the block move in the same direction as the plane. Is the plane pushing it? What force is that? I understand the other forces on the block (gravity, normal force, friction), I just don't understand what makes it "go along" with the plane.
Am I making any sense?
Thanks.
this seems to be an easy enough problem, but for some reason I'm having problems with it.
Homework Statement
A block slides down an inclined plane, and the inclined plane slides horizontally. There is friction at the incline's upper surface, but not at its lower surface. For each body, draw a free body diagram.
Homework Equations
- none, we only need to draw the free body diagram
The Attempt at a Solution
I have already identified the usual suspects:
Forces on plane:
- the force of gravity, acting downwards
- the normal force, acting upwards
- Additionally, I know that the plane is sliding along a level floor. Because there is no friction (stated in the problem), there is no force resisting the motion, and, assuming that it slides at a constant velocity, that means that there is no horizontal force acting on it at all (because the horizontal component of the net force must be zero)
- the weight of the block also acts on the plane, so we have another force acting downwards here.
Here comes the tricky part: I'm not really sure what makes the block move in the same direction as the plane. Is the plane pushing it? What force is that? I understand the other forces on the block (gravity, normal force, friction), I just don't understand what makes it "go along" with the plane.
Am I making any sense?
Thanks.