Simple Machine
List all 6 simple machines.
Lever, Pulley, Wedge, Screw, Wheel and Axle and inclined plane
Provide two examples of a class one lever
See saw, scissors, pliers
Provide two examples of a pulley
Elevators, cranes, flagpole, projector screen, blinds, water well
Provide 2 examples of an inclined plane?
ramps, slides, roofs, hills
Provide 2 examples of a wheel and axle
doorknob, wagons, ferris wheel, windmill,
What is work?
Work is when the object moves when force is used
Provide two examples of a class two lever
Wheelbarrow, nutcracker, car door
Provide two examples of a screw
bottle lids, lightbulbs, drills, corkscrew, faucet
Provide 2 examples of a wedge
Knives, axes, door stopper, teeth
What is force?
Force is effort being put to move an object, whether pulling or pushing.
Provide two examples of a class three lever
Tongs, human arm, catapult, stapler
A screw with more ridges/grooves may take longer to be turned because it won’t dig into the material quickly but less work is needed
What is a characteristic of a wedge?
Two slanted sides coming to a sharp point to cut through objects
What is a simple machine?
A simple machine is an object in our everyday life that helps to make work easier by using less force.
Explain the effects of moving the fulcrum of a class 1 lever.
If the fulcrum is moved closer to the side with the load, less force is needed to move the object (less work is needed)
Explain how a pulley works?
Pulleys is a simple machine that has a rope or string that goes around a wheel at the top and hangs down. The load is attached on one end of the rope. When the other side of the rope is pulled, the wheels take the weight of the object, allowing it to go up.
Explain the relation between distance and inclined planes
The steeper the inclined plane/ramp the more work is needed to bring an object or load up. This means over a longer distance (ramp is less steep), then less work is needed to pull an object up
What is friction?
Friction is a force that stops or slows moving objects.
Explain how class 1, class 2 and class 3 levers work.
Class 1 lever:
The lever goes over a fulcrum. The load is on one side of the lever. When force is used on the other side of the lever, the load goes up.
Class 2 lever:
The force is on one side holding up the load which is in the middle of the lever. The lever is balanced on a fulcrum on the other end.
Class 3 lever:
Force is being put in the middle of the lever.
What is Archimedes’s most famous invention and what did it do?
Archimedes’s most famous invention is the Archimedes Screw which helped bring/transport water from lower areas to a higher place.
Explain the relation between friction and inclined planes.
The smoother the surface of the object and the inclined plane, the less friction. This means with the help of gravity objects can just slide down easier on smoother surfaces (surfaces with less friction) and it is easier to pull things up on surfaces that don’t have friction.