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Did your know your body uses levers to function? there are levers in your arms and legs. There are even levers from your head to foot!

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Mechanical Advantage of Ramps, Wedges, & Wheels

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Mechanical Advantage of Ramps, Wedges, & Wheels

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To find the mechanical advantage of a ramp, divide the length by the height. For a screw, divide circumference by lead. The

mechanical advantage for a wedge is inversely related to the size of the

wedge angle. Finally, The mechanical advantage of a wheel and axle is the ratio of the radius of the wheel to the radius of the axle

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A ramp is a simple machine that allows you to raise a heavy object, such as a wheeled cart, with less force than you would need to lift it straight up. A screw is a simple machine that turns rotating motion into linear motion. A screw works just like a ramp that curves as it gets higher. A wedge is like a ramp that can work while in motion (a ramp is always stationary). A wedge has a side that slopes down to a thin edge. A wheel rotates around a rod called an axle. The wheel and axle move together to move or lift loads.

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Ropes and strings carry tension. In a pulley system, the more ropes you have the more mechanical advantage you will have. if you have less ropes, you will have a lesser mechanical advantage

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Gear Ratio is the ratio of output turns to input turns to a pair of gears. to find it, use the formula below.

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Gears transfer motion and force with their teeth. They also multiply force and change the speed of rotation. If the output gear is larger then the force will be multiplied.

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Levers are useful because you can arrange the fulcrum and the input and output arms to adjust the mechanical advantage of the lever. There are also three classes of levers, but in the end, they all do the same thing; accomplish a task with one movement and the all use a fulcrum & lever arms.

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When the mechanical advantage is greater than one, the output force is bigger. When the mechanical advantage is less than one, then the  output is smaller than input.

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A Mechanical Advantage is the ratio of output force divided by input force.

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This pulley does not multiply force, but it changes direction.

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A simple machine only does output work if you do input work on the machine. To find the efficiency of a machine, you divide the output by the input then multiply by 100. Did you know machines make work easier? the picture below explains how they do this. But overall, machines multiply the amount of force or the distance.

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A Gear is a rotating wheel with teeth that transfers motion and forces to other gears or objects. the picture below shows two gears.

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A Lever is a stiff structure that rotates around a fixed point called a fulcrum.

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A Simple Machine is a an unpowered mechanical device that accomplishes a task with only one movement. The picture below has some examples of a simple machine.

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The Input of a process are forces, energy, or power supplied to make a machine accomplish a task. On the other hand, the Output of a process is

forces, energy, or power provided by the machine. In the picture below, the pink arrow represents the input force and the yellow arrow represents the output.

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A Machine is a device with moving parts that work together to accomplish a task. The bike below is a example of a machine.

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Horsepower is a unit of power equal to 746 watts.

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A Watt (W) is a unit of power

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Power is equals work divided by time.

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Power is the rate of doing work or moving energy.

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Efficiency equals the output work divided by the input work.

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The Efficiency of a machine is the ratio of usable output work divided by total input work. The efficiency of a process is usually represented in percentages.

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The Work Input is the work or energy supplied to the process, while the

Work Output is the work or energy that comes out of the process. The total energy of work output can never be greater than the total energy of work input. The diagram below; has a pulley that shows work input & output. Sometimes work input may be greater than output, but it will never be greater than input.

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Work is only done by the part of a force that acts in the same direction as the resulting motion.

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Work done against gravity is equal to weight multiplied by the change in height.

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Energy is always needed to do work. Doing work always means transferring

energy. Did you know, work may not

increase the energy of an object?

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Use the formula below to find the amount of work being done.

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Work Done and Power | GCSE Physics | Doodle Science

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Work is the transfer of energy that results from applying a force over a distance

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Meaning of Work Here you can see a carpenter hitting a nail into a wooden block, a man pushing a table and a girl pushing a wall. For a lay person all of them are doing work.

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Nuclear Energy -form of energy stored in the nuclei of atoms.

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Chemical Energy -form of energy stored in molecules.

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Mechanical Energy -form of energy related to motion & position.

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Energy cannot be created nor destroyed. It can only be Transformed from one form to another

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The Law of Conservation of Energy states that energy can never be created or destroyed, only transformed into another form. The total amount of

energy in the universe is constant.

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Kinetic Energy is energy of motion.

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Potential Energy is energy due to position.

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Radiant Energy -form of energy represented by the electromagnetic spectrum below:

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A Joule (J) is a unit of energy.

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Energy is a quantity that describes an object's ability to change or cause change.

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What is energy and why are we on a never ending search for new energy sources?