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A knife could be a lever or wedge depending on what kind and how you use it. If it's just between lever and inclined plane its lever, NOT inclined plane

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What causes the mechanical advantage of the inclined plane to be less than the lever?

The mechanical advantage of an inclined plane is less than that of a lever because the inclined plane allows for the exertion of a smaller force over a longer distance to move objects up an incline. In contrast, the lever utilizes the principle of leverage to magnify an applied force, making it more efficient in lifting heavy objects.


What happens to force when the height of the incline plane is reduced?

As the height of the incline plane is reduced, the gravitational force acting on the object decreases. This, in turn, reduces the component of the force acting parallel to the incline, resulting in a lower force required to move the object up the incline.


Does the direction of the force change in an incline plane?

Yes, in an inclined plane, the force has both a component parallel to the incline (the gravitational force) and a component perpendicular to the incline (the normal force). The normal force always acts perpendicular to the surface, while the gravitational force acts parallel to the incline.


Are knife is a 1st class lever?

No, a knife is not a 1st class lever. A 1st class lever is a system where the fulcrum is positioned between the effort and the load. In the case of a knife, it typically functions more like a 3rd class lever where the effort is between the fulcrum and the load, such as when cutting through food.


How does the angle of an incline plane affect the force needed to move and object?

The steeper the incline plane, the greater the force required to move an object up the incline. This is because the component of the force needed to overcome gravity acting against the object's weight on the incline becomes larger as the angle increases. A shallower incline requires less force to move the object up it.