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In practice we are given an angle (generally from the horizontal or vertical) and we use trigonometry 20N 20 sin 300N cos 300N.

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Presentation on theme: "In practice we are given an angle (generally from the horizontal or vertical) and we use trigonometry 20N 20 sin 300N cos 300N."— Presentation transcript:

1 Any vector can be resolved into two components at right angles to each other.

2 In practice we are given an angle (generally from the horizontal or vertical) and we use trigonometry 20N 20 sin 300N 300 20 cos 300N

3 THE FRICTIONLESS INCLINED PLANE
Normal Force The component of gravity pushing down the plane Component of gravity equal and opposite Normal Force Weight θ

4 The weight force forms the hypotenuse of a right angled triangle
The weight force forms the hypotenuse of a right angled triangle wcos  is the component of the weight force equal to the normal force but opposite in direction w cos  w w sin  wsinθ is the component of the weight force pushing the block down the ramp

5 With Friction If the block is not moving or is moving at steady speed the friction force = wsinθ Normal Force Friction wcos  If the block is accelerating the friction force is smaller than wsinθ wsinθ wcos 

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