Levers
a ______is simply a rigid bar that rests on a pivotal point called a fulcrum.
lever
a _________ is typically a disk that rotates.
Wheel
List the three main types of pulleys
1 wheel, 2 wheel, 4 wheel
True or False?
Stairs and ramps are incline planes
True
Describe the structure of a screw
Cylindrical base and ridges
_____ are the three types of levers
1st class, 2nd class, 3rd class
A(n) _____ is either a smaller disk, cylinder, or shaft that attaches to the wheel.
Axle
This class of pulley gives a mechanical advantage of four
4 wheel
Describe how the load moves on an incline plane
From bottom to top/upwards
What are the 2 parts of work
Force and distance/displacement
In this type of lever the fulcrum (or pivot) is in the middle
1st class
A ______ consists of a wheel with noches/teeth around its circumference.
Gear
True or False?
An elevator is considered a pulley
True
A ______ is a type of inclined plane but is thick at one end and tapers to a point on the other, often used to separate things.
Wedge
Which of newton's laws does torque resemble
Newton's second law
2nd class
§What is one wheel and axle you may find on a microscopic level?
Motor in E coli bacteria
How do pulleys make work easier
They can change the direction of a force
Why do wedges go through objects easily
The change in direction of the force
The ratio of the force produced by a machine to the force applied to it is the ______
mechanical advantage
List the four parts of a lever
Beam/bar, resistance/effort, load, and fulcrum/pivot
§A wheel and axle is a system that reduces _____ in moving objects.
friction
Describe the structure of a pulley system
A pulley system is a wheel with a groove around its circumference mounted on an axle. A rope, cable, or belt rests in the groove and moves with the pulley as it rotates.
True or False
The eraser on your pencil is a wedge
false
Calculate the mechanical advantage of a rope and pulley system that requires 10 newtons of force to lift a 200-newton load.
200/10 = 20