Question

D. Differentiate between the following.
1. Second class and third class levers
2. Simple and complex machines
3. Inclined plane and screw
4. Single fixed and single movable pulleys​

Answer 1

Answer:

Third Class Levers

If the fulcrum is closer to the effort, then the load will move a greater distance. A pair of tweezers, swinging a baseball bat or using your arm to lift something are examples of third class levers.Examples include see-saws, crow bars, hammer claws, scissors, pliers, and boat oars. The claw end of a hammer, along with the handle, is a Class 1 Lever. When pulling a nail, the nail is the Load, the Fulcrum is the head of the hammer, and the Force or effort is at the other end of the handle, which is the Beam.First class levers have a fulcrum in the middle, between effort and resistance, while second class levers have resistance between the fulcrum and effort. Third class joints are the ones that describe most joints of the body; the effort is between the resistance and the fulcrum (like the forearm).Simple Machine: Any of various devices that function in a manner basic to any machine, such as a lever, pulley, wedge, screw, or inclined plane. Complex Machine: A device consisting of two or more simple machines working together. ... You push a screw into a surface by turning it while pressing down on the head.An inclined plane makes work easier by breaking an upward or downward movement into smaller increments. Examples of inclined planes include slides, ramps, and hills. A screw is like an inclined plane wrapped around a cylinder. A screw turns a small rotational force into a larger forward driving forceSingle fixed pulley Single movable pulley

3. Its velocity ratio is one. 3. Its velocity ratio is two.

4. The weight of pulley itself does not affect its mechanical advantage. 4. The weight of pulley itself reduces its mechanical advantage.

5. It is used to change the direction of effort. 5. It is used as force multiplier

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Answer 2

Answer:

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Explanation:

Simple Machine: Any of various devices that function in a manner basic to any machine, such as a lever, pulley, wedge, screw, or inclined plane. Complex Machine: A device consisting of two or more simple machines working together. .. A wedge is driven or forced between objects to split, lift, or make them stronger.