Lever
What is a Lever?
a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.
What is a Pulley?
a wheel with a grooved rim around which a cord passes.
What is a Wheel and Axle?
a circular object that revolves on an axle and is fixed below a vehicle or other object
What is a Inclined Plane?
a plane inclined at an angle to the horizontal.
What is a screw?
a short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head.
What is a Class 1 lever?
a Class 1 lever has the fulcrum placed between the effort and load. The movement of the load is in the opposite direction of the movement of the effort.
How does a pulley work?
it acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights.
How does a wheel and axle work?
enables objects to move easily over the ground.
How does an inclined plane work?
Ramps up heavy loads and moves them around.
How does a screw work?
used to join things together by being rotated so that it pierces wood or other material and is held tightly in place.
What is a Class 2 lever?
a Class 2 lever has the load between the effort and the fulcrum. The movement of the load is in the same direction as that of the effort.
What is a fixed pulley?
one in which the drum is secured to a single spot, the fixed pulley allows you to change the direction of the force needed.
How does a bike use a wheel and axle?
It uses wheels to spin in a balanced circle around an axle.
True or false:
Is a wheelchair ramp a inclined plane?
True
True or false:
Is the blades of a fan a screw?
True
What is Class 3 lever? Give an example.
a Class 3 lever has the effort between the load and the fulcrum. Both the effort and load are in the same direction. An example can be, tweezers, stapler, mousetrap.
What is a movable pulley?
a movable pulley is one in which drum moves as you are moving the load. There is no change in the direction of force that you need to apply.
Is a wheel and axle a lever?
A wheel and axle is a type of lever.
True or false:
Will an object on an inclined plane move a longer distance?
True
Is a screw an inclined plane?
Yes, a screw is really an inclined plane that is coiled around a shaft.
What is a double class one lever example?
a scissors or a pair of pliers
What is a compound pulley?
Uses both a moveable pulley as well as a fixed pulley which not only makes the load "feel" lighter, but you can also change the direction of the force.
When was the first appearance of a wheel?
Wheels first appeared in ancient Mesopotamia, modern-day Iraq, more than 5,000 years ago.
What will happen if the inclined plane is steep?
The steeper the slope of the inclined plane, the more effort it takes to move the person in the wheelchair up the slope.
How do you use a small gear which is being used to drive the big gear.
In this case, the small gear will need to rotate twice in order to turn the big gear around once. This is producing a gain in force.