Contents
Critical teaching ideas
Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever.
There are three ways simple machines make work easier: by increasing the distance through which force is applied, by changing the direction of applied force, or by multiplying force of speed of the energy applied.
Some examples of pulleys include cranes, flag poles, and window blinds. When multiple pulleys are used together it’s called a block and tackle. Another use of the pulley is with a flat wheel and belts. These kinds of pulleys are often used in cars.
Pen is a common and highly preferred accessory that appears as a kind of simple machine. When it comes to a simple machine, it is one types of machines used for transferring certain amount of energy from one destination to other place. Apart from that, they also allow people to do their work.
Most of the machines you encounter in everyday life are complex. However, break them down to their smallest parts and you’re left with simple machines: wheels, levers, wedges and screws. Simple machines magnify, spread out, or change the direction of force, making it easier to move, cut and bind objects.
Some examples of the wheel and axle include a door knob, a screwdriver, an egg beater, a water wheel, the steering wheel of an automobile, and the crank used to raise a bucket of water from a well. When the wheel in a wheel and axle machine is turned, so is the axle, and vice versa.
Place a ruler on a used-up paper towel or toilet paper roll. This constitutes a lever, with the cardboard roll serving as the fulcrum. By making the end that is lowered longer, the shorter end exerts a greater force on any load it lifts.
A hammer is an example of a lever. A lever is a simple machine consisting of a bar that rotates around a fixed point called the fulcrum.
Wheelbarrows are compound machines consisting of 3 simple machines: a lever, wheel and axle, and an inclined plane. The wheelbarrow makes use of a class 2 levers: the resistance load is between the fulcrum (wheel) and the location of the effort force (hand grip).
This is because the force of gravity is acting on the weight of your body, pulling it and the beam down. How much weight is pulling down on the beam depends on your body mass. The heavier you are, the larger the gravitational force. To balance the beam again, you need a counteracting force on the other side.
An inclined plane is a flat surface that is higher on one end. Think about lifting and moving a heavy box into the back of a truck. It is hard work. It is easier to move the heavy box or load into the truck using an inclined plane.
In this classroom/lab, students investigate how complex machines are made up of two or more simple machines using four common appliances: radio, blender base, toaster, and hand-held blender.
Inclined plane.
Inclined planes in their simplest form are ramps, simple machines that help us move objects to higher or lower.
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