119 Views

Download Presentation
##### Simple Machines & Their Mechanical Advantages

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**Wedge**• It is used to push an object(s) apart. • It is made up of two inclined planes. These planes meet and form a sharp edge. • The edge can split things apart.**Inclined Plane**• It is a flat surface that is higher on one end. • You can use this machine to move an object to a lower or higher place • Makes the work of moving things easier. You would need less energy and force to move objects with it.**Lever**• It is a board or bar that rests on a turning point. This turning point is called the fulcrum. • An object that a lever moves is called the load. • The closer the object is to the fulcrum, the easier it is to move.**Pulley**• It is made up of a wheel and a rope. The rope fits on the groove of the wheel. One part of the rope is attached to the load. • When you pull on one side of the it, the wheel turns and the load will move. • This device allows you to move loads up, down, or sideways.**Screw**• It is made from another simple machine. • It is actually an inclined plane that winds around itself. It has ridges and is not smooth like a nail. • Some of them are used to lower and raise things. • They are also used to hold objects together.**Wheel and Axle**• It has an axle which is a rod that goes through the wheel. • The axle lets the wheel turn. • Together, these devices allow things to be moved easily from place to place.**Kinds of Lever**• There are three different kinds of levers. • The location of the fulcrum, resistance arm, and effort arm is what makes them different**Kinds of Lever**• All levers have two arms, called the effort arm and the resistance arm.**Kinds of Lever**• The effort arm is the distance from the fulcrum and the effort.**Kinds of Lever**• The resistance arm is the distance from the fulcrum and the resistance.**A First-Class Lever**The fulcrum is located between the force and resistance.**A Second-Class Lever**Is set-up so that the resistance is between the force and fulcrum**A Third-Class Lever**The force is between the resistance and the fulcrum.**Lever Equation**This equation can be used to find unknowns: Effort Force X Effort Arm Length = Resistance Force X Resistance Arm Length**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot?**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force X Effort Arm Length = Resistance Force X Resistance Arm Length**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force X 4 ft. = Resistance Force X Resistance Arm Length**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force X 4 ft. = 100 lbs. X Resistance Arm Length**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force X 4 ft. = 100 lbs. X 1 ft.**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force X 4 ft. = 100 lbs. per ft.**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force = 100 lbs. per ft. / 4 ft.**Finding Lever Unknowns**How much force is needed to move a rock that weighs 100 pounds using a lever with an arm length of four feet and a resistance arm length of one foot? Effort Force = 25 lbs.**A Lever’s Mechanical Advantage**The mechanical advantage (M.A.) of a lever is determined by dividing the length of the effort arm by the length of the resistance arm. M.A. = Effort Arm/ Resistance Arm**A Lever’s Mechanical Advantage**What is the mechanical advantage for a lever with an effort arm of 6 meters and a resistance arm of 1.5 meters?**A Lever’s Mechanical Advantage**What is the mechanical advantage for a lever with an effort arm of 6 meters and a resistance arm of 1.5 meters? M.A. = Effort Arm/ Resistance Arm**A Lever’s Mechanical Advantage**What is the mechanical advantage for a lever with an effort arm of 6 meters and a resistance arm of 1.5 meters? M.A. = 6 m/ Resistance Arm**A Lever’s Mechanical Advantage**What is the mechanical advantage for a lever with an effort arm of 6 meters and a resistance arm of 1.5 meters? M.A. = 6 m/ 1.5 m**A Lever’s Mechanical Advantage**What is the mechanical advantage for a lever with an effort arm of 6 meters and a resistance arm of 1.5 meters? M.A. = 9 The mechanical advantage of this lever is 9. This means that the lever multiplied the effort 9 times.**A Wheel and Axle’s Mechanical Advantage**The mechanical advantage (M.A.) for a wheel and axle is determined by dividing the diameter of the wheel**A Wheel and Axle’s Mechanical Advantage**The mechanical advantage (M.A.) for a wheel and axle is determined by dividing the diameter of the wheel by the diameter of the axle.**A Wheel and Axle’s Mechanical Advantage**What is the mechanical advantage of the wheel that has a diameter of 25 cm and an axle with a diameter of 2 cm?**A Wheel and Axle’s Mechanical Advantage**mechanical advantage (M.A.) = diameter of the wheel / the diameter of the axle**A Wheel and Axle’s Mechanical Advantage**mechanical advantage (M.A.) = 25 cm / the diameter of the axle**A Wheel and Axle’s Mechanical Advantage**mechanical advantage (M.A.) = 25 cm / 2 cm**A Wheel and Axle’s Mechanical Advantage**mechanical advantage (M.A.) = 12.5 The mechanical advantage of this wheel with this axle is 12.5.**Mechanical Advantage Of A Fixed Pulley**The mechanical advantage (M.A.) of a moveable pulley is determined by the number of supporting ropes. The mechanical advantage (M.A.) of a fixed pulley with one supporting strand is 1.**Mechanical Advantage Of A Fixed Pulley**The mechanical advantage (M.A.) of a moveable pulley is determined by the number of supporting ropes. One supporting strand. The effort needed to lift a 10 gram weight is 10 grams (10/1).**Mechanical Advantage Of A Moveable Pulley**The mechanical advantage (M.A.) of a moveable pulley is determined by the number of supporting ropes. The mechanical advantage (M.A.) of a moveable pulley with two supporting strand is 2.**Mechanical Advantage Of A Moveable Pulley**The mechanical advantage (M.A.) of a moveable pulley is determined by the number of supporting ropes. Two supporting strands The effort need to lift a 10 gram weight is 5 grams (10/2).**Mechanical Advantage of An Inclined Plane**The mechanical advantage (M.A.) of an inclined plane is the length of the incline divided by its height.**Mechanical Advantage of An Inclined Plane**A man is using an 8 foot board to slide things into the back of his truck. The truck is 2.5 feet from the ground. What is the mechanical advantage of this incline?**Mechanical Advantage of An Inclined Plane**mechanical advantage (M.A.) of an inclined plane = the length of the incline / by its height