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MECHANISMS (LINEAR MOTION MACHANISMS (LEVERS (~ Ty pes of levers (There…
MECHANISMS
LINEAR MOTION MACHANISMS
Mechanisms that transnut motion and force in a straight line from one point to another.
Examples include levers and fixed, mobile and compound pulleys.
A lever is a rigid bar that is supported by a fulcrum.
• F is the force or effort appbed at one end of the bar.
• R i s the resistance or load which acts at the other end of the bar.
• d is the distance from F to the fulcrum
• r is the distance from R to the fulcrum
The following equauon mdicates a balanced lever: F d= R r
It's called the law of the lever.
~ Ty pes of levers
There are three types of levers: class l, class 2 and class 3. These classilications are based on the relative position of the lever, the effort applied and the resistance.
Class 1
The fukrum is between the effort appied and the resistance. The effect of the effort applied ran be multiplied or reduced
Class 2
The resistance ii between the fulcrum and the effort applied. The effen of the effort apphed is always muitiphed (d > r).
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A fixed pulley is balanced when the effort F is equal to the resistance of the load R: F = R
Uses: wells and gym equipment, for example
A moveable pulley is balanced when it satisfies this equation. F =R/2
This ts a system of fixed and moveable pulleys, often called block and tackle.
Uses; lifts, goods lifts and cranes
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Around us we can see many moving obiects and mechanisms that produce movement that we can also call motion.
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Mechamsms are devices that transmit and convert forces and motion from a dtiving force or input element to an output element.
They allow us to carry out certam tasks more easily and more effioently
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