Simple Machines
What is an inclined Plane?
A slanting surface that connects a lower level to a higher level.
What is a lever?
A stiff bar that rests on a pivot point (fulcrum).
What is a physical system?
A group of physical parts that work together to perform a function.
A spring scale or force meter.
What is direction?
Refers to which way the force is pulling or pushing.
If someone pushing something but it doesn't move, has work been done?
NO!
What is Automation?
Having a machine or system perform tasks that were once done by humans
True or false - The thinner the wedge, the less force needed to press it into an object.
True
What are the three different types of levers?
1st Class, 2nd Class, 3rd Class
What is a social system?
A group of people, or other organisms, joining together to perform tasks and establish relationships.
What is the name for the unit used to measure Forces.
Newtons
Pull of the Earth
Gravitational Force
If 3 friends are pushing a log and exert 200 N of force each, and they push the log 4 m, how much work has been done?
3 x 200 = 600N
W = F x d
W = 600N x 4m
W = 2400J
What is AI?
Artificial Intelligence used to improve systems by using machines that can think and learn like humans.
An inclined plane wrapped around a pole or cylinder.
It is a lever with the fulcrum on one side, the effort on the other side and the load in the middle. E.g. Wheelbarrow.
True or False - The solar system is an example of a man-made physical system.
False. It is a natural system.
What is the unit used to measure Work?
Joules or Newtons/metres
Twist, Turn, Wring, Coil, Twist
Rotational Force
How does the Netherlands use Drones to help grow tomatoes?
THEY KILL THE BUGS!!!!
No... there is always friction or some energy loss.
What is a wheel and Axle? How does it create MA?
A circular device with a rod (axle) through its centre. When the axle turns the wheel it creates greater distance so less force is applied.
Tweezers, hammers and shovels are examples of which class of lever?
Third Class!
Pick an example of a social system and explain how it works and why it's a social system.
Answers may vary.
What is magnitude?
A measure of how strong a force is.
Crushing, Squashing, squeezing, Pressing
Compressive Force
What is efficiency?
Doing something better and faster, with less resources.
How does automation affect production?
It will improve production speed and accuracy.
FALSE - A pulley changes the direction of the force making it EASIER to pull!
What is a 3rd class lever?
It is the fulcrum on one side, the effort in the middle and the load on the other side. E.g. Your arm when you are lifting something.
Pick an example of a physical system and explain how it works and why it's a physical system.
Answers may vary.
What is friction?
The resistance that one surface or object encounters when moving over another.
Tightening or stretching
Tensile Force.
Can a machine ever be 100 % efficient?
Machines can never be 100 % efficient because there is always friction, the force that resists movement.
Calculate the efficiency of a lever that has:
Lifts a 400N rock 0.5m
A human pushing the lever 200N down 2m
e = Output force / Input force x 100
e = 400 x 0.5 / 200 x 2 x 100
e = 200/400 x 100
e = .50 x 100
e = 50 % efficient