Levers
This rotates around a fixed point to form a lever
What is a rigid bar?
A lever rotates around this fixed point
What is a fulcrum?
The two types of pulleys
What are fixed and moveable pulleys?
The main use of a screw
What is holding things together?
The purpose of a simple machine
What is to make work easier?
Give an example of a first-class lever
What is a see-saw?
(scissors, light switch, etc.)
A fixed pully is a modified lever of this class
What is a first-class lever?
Give an example of a fixed pulley
What is a crane, elevator, etc.
Provide two examples of an inclined plane.
Examples: slide on playground; handicapped ramp; a ladder; a roller coaster ride (track).
The way that simple machines make work easier
What is changing the direction or size of force needed to do work?
What is a fulcrum?
This part of a lever is in the middle of a second-class lever
What is the load?
How a moveable pulley affects the effort to move a load
What is cutting the effort in half?
The way that the length of an inclined plane affects the effort needed to move a load
What is by increasing the length of the plane to reduce the force needed?
Machines with many parts
What are complex machines?
Demonstrate a second-class lever
Examples: standing on tip toes (calf muscles); pushing a wheelbarrow, opening a door, etc.
Demonstrate a third-class lever
Examples: baseball/tennis/golf swing, bicep, tweezers
The way that a wheel and axle makes work easier
What is by reducing friction (makes it easier to move heavy loads)?
A wedge turns an input force into this kind of output
This must be true of an electric circuit for electricity to flow
What is the circuit being closed?
What is to increase the distance or length of the lever?
A moveable pully is a modified lever of this class
What is a second-class lever?
A wheel and axle acts as a modified lever. This is the part of the simple machine that acts as the fulcrum of the lever
What is the axle?
The way that a screw changes an input force
What is transforming a rotational force into linear motion?
Using simple machines gives you this when you perform work
What is mechanical advantage?