# Mechanical Reasoning Review

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2 First Order Levers Look at the first picture in the diagram on the page one. The pivot (fulcrum) is between the load and the effort. In some cases, like a see-saw, the fulcrum is in the middle. In other cases it is off-centre, like in pliers. In these cases, the load is larger than the effort, but it is moved across a shorter distance. Some tools have more than one lever, such as pliers. Examples of first order levers: see-saw, scissors, pliers, pry bar. Second Order Levers Look at the second picture in the diagram on the page one. The fulcrum is at one end, the effort at the other end, and the load is in between. See diagrams below. Examples of second order levers: stapler, bottle opener, wheelbarrow, nutcracker, nail clippers. Third Order Levers Look at the third picture in the diagram on the page one. The fulcrum is at one end, the load at the other end, and the effort somewhere in between. See diagrams below. Examples of third order levers: shovel, fishing rod, tweezers, tongs.

3 Inclined Plane An inclined plane is a sloped surface, or a ramp, along which a load is moved. It allows one to overcome a large resistance by applying a relatively small effort across a longer distance than the load actually has to be moved. Slope is a measure of the angle by which an inclined plane is elevated from the horizontal. o The greater the slope, the less the advantage: more effort is required. o The less the slope, the more the advantage: less effort is required. Effort is the force required to move the load. Examples of inclined planes: ramps, switchbacks, ladders, dump trucks 2. Wedge A wedge is related to the inclined plane. It is a moving inclined plane. Generally it can be anything that splits, cuts, or divides another object (including air and water). It tapers from a sharp edge to a blunt end along its longitudinal axis. The more gradual the taper, the greater the mechanical advantage. A fairly weak force, applied to the wide end of a wedge whose narrow end is being pushed into something, will send a strong force pushing out at the sides. Applied to a ship s bow, a wedge divides the water smoothly, minimizing the energy required to push the water away so that the ship can move forward. Sometimes the tapered ends are pointed, and sometimes they are blunt Examples of wedges with pointed ends: bullets, nails, pencils Examples of wedges with sharp ends: axes, wedges, chisels, shovels, knives, the prow of a boat.

4 3. Screw A screw is another form of an inclined plane. A screw is an inclined plane (thread) wrapped around a rod to form a spiral. This inclined plane allows the screw to move itself or to move an object or material surrounding it when rotated. The less the slope on the plane, the less distance there will be between the threads of the screw, and less effort will be required to move the load. While turning, the screw converts rotary motion to forward or backward motion. Example: screw, threaded bolt, spiral staircase, screw lid on jar, car or house jack 4. Wheel And Axle A wheel and axle is basically two circular objects of different sizes. The wheel is the larger object that turns the smaller object called the axle. When the wheel turns the axle, movement is created. The wheel is always larger than the axle, so it always moves a greater distance than the axle. Mechanical advantage depends on the radius of the wheel and the axle. A wheel and axle machine is used in two ways: 1. To roll something along, cutting down on the amount of friction between the surface and the load. Generally, the bigger the wheel, the easier it is to move the load. Examples: wagon, dolly, truck, roller skates 2. Like a lever in the round that turns and has the fulcrum in the middle. The larger the diameter of the wheel, the less effort needed to turn it, but it has to be moved a greater distance to get the work done. The amount of work does not change. Examples: door knob, screwdriver, sink faucet, pencil sharpener, hand drill

5 5. Gears Gears are wheels that that have teeth or cogs on their edges and are used in combinations of different sizes. There are different types of gears; the ones in the pictures below are spur gears. Intermeshing gears are used to transmit motion or force. They are used in three ways: 1. to multiply or reduce speed and force 2. to change direction of motion 3. to transmit a force over a distance Gear terms: Train: A series of intermeshing gears. Gears turn in opposing directions. Driver: The gear in a train that has the force or motion input Driven: The gear that has the force or motion output (follower) Ratio: The number of teeth on the follower divided by the number of teeth on the driver. Rule: Low gear ratio = more speed = less force High gear ratio = less speed = more force. Examples of gears in use: wind-up clocks, bicycles, power meters. In the picture below, the smallest wheel has 12 teeth, while the largest wheel has 24 teeth. The small wheel rotates twice for each rotation of the large wheel.

7 For more information on simple machines and mechanical advantage, visit these websites: Other Areas of General Science Knowledge There are many other areas of science besides mechanical advantage that you might want to review: 1. Volume 2. Balancing Scales 3. Mirrors and reflection 4. Magnetism 5. Gravity 6. Electricity 7. Friction For mechanical reasoning practice tests, visit:

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