Levers
A lever is a rigid bar that rotates around this point.
What is a fulcrum?
A pulley is a wheel with this along its edge.
What is a groove?
This pulley has a fixed axle.
What is a fixed pulley?
These are devices that transmit and convert forces and motion.
What are mechanisms?
A pulley is used when objects are too this to lift by hand.
What are large or difficult?
You can build a simple lever using these two classroom items.
What are a pencil and a ruler?
Pulleys are mainly used to do this with heavy objects.
What is lift (or raise and lower)?
This pulley has an axle that moves with the load.
What is a movable pulley?
Mechanisms help us perform tasks with less effort and this.
What is bigger comfort?
Using a pulley allows you to change the ___ of lifting.
What is direction?
There are this many types of levers
What is three?
A pulley changes the direction of this.
What is force?
This pulley combines fixed and movable pulleys.
What is a compound pulley?
Mechanisms mainly help reduce this when doing work.
What is effort?
Pulling down on a rope allows you to use this to lift objects.
What is your weight?
The classification of levers depends on the position of these three things.
What are the fulcrum, load, and applied force?
The three main parts of a pulley system are these.
What are a wheel, axle, and rope?
A movable pulley has this mechanical advantage.
What is 2?
Mechanisms change both force and this other physical quantity.
What is motion?
A pulley system is balanced when effort equals this.
What is load (or resistance)?
These are the three classes of levers.
What are first class, second class, and third class levers?
This part holds the wheel in place.
What is the axle?
The more pulleys used in a system, the ___ effort is needed.
What is less effort?
The main purpose of mechanisms is to make tasks easier by changing force and this together.
What are force and motion?
This type of pulley allows you to lift with half the effort.
What is a movable pulley?