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Net Force. Unbalanced Forces  Newton’s Second Law requires a net force. One or more forces act on an objectOne or more forces act on an object Forces.

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Presentation on theme: "Net Force. Unbalanced Forces  Newton’s Second Law requires a net force. One or more forces act on an objectOne or more forces act on an object Forces."— Presentation transcript:

1 Net Force

2 Unbalanced Forces  Newton’s Second Law requires a net force. One or more forces act on an objectOne or more forces act on an object Forces are vectors that can be addedForces are vectors that can be added  Add all vector forces acting on a object. If the sum is zero – equilibrium.If the sum is zero – equilibrium. If the sum is not zero – net force.If the sum is not zero – net force.

3 Force Vectors  Force is a vector.  A block sliding on an inclined plane has forces acting on it.  We know there is a force of gravity and normal force. m 

4 Force Diagram  Draw the forces acting on the block.  The force of gravity points down with magnitude F g = mg.  The normal force points away from the surface of the inclined plane. m 

5 Force Diagram  Draw components of the forces so the vectors can be added.  The coordinates should point along the surface. The normal force is unknown The motion will be along the surface  The components of F g are compared to the surface. m 

6 Net Force  The block stays along the plane. No motion or acceleration away from the surface No force in that component  Solve for the normal force:  Solve for the net force: m 

7 Motion from Force  The net force causes the block to accelerate.  The amount of acceleration is force divided by mass.  This is a constant acceleration moving the block. m 

8 Inclined Plane  Pushing a block up an incline is easier than lifting.  To get constant velocity a force equal to the downward acceleration must be applied. m  next


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