Simple Machines
What are simple machines?
Make work easier.
They have few or no moving parts and they work by changing the direction of a force or the amount of force needed to do something.
Six different types.
What are Levers?
A beam rests on something underneath and moves up and down. A seesaw is a lever.
A lever helps move heavy objects.
When you push down on one side of a lever, the other side goes up.
What is an Inclined Plane?
An inclined plane does not have moving parts.
It has a flat surface inclined at an angle.
It helps us move heavy objects from higher or lower levels.
By sliding or stepping.
What are wheels and axles?
Works together with two essential parts.
One or more wheels are attached to a rod that helps them spin, called the axle.
It helps us move loads with less force.
They help us travel.
Only the wheel moves.
What is a pulley?
A wheel and rope that can change the direction of a force.
A Simple Machine with a fulcrum?
Lever
What is a Load?
The object that is being lifted or affected.
Ex. On a seesaw, whoever is being lifted is the load.
What is friction/resistance?
Is a force that slows down movement.
Anytime an two objects touch friction is created.
Friction makes moving things harder.
What are Friction and Resistance?
Is a force that slows down movement.
Anytime two objects touch, friction is created.
Friction makes moving things harder.
Wheels reduce friction.
Instead of simply sliding over the ground, the wheels dig in and rotate, turning around sturdy rods called axles.
Where is the force in a pulley?
Is it a Pull or a Push?
Pull
A Simple Machine that has no moving part?
Inclined Plane
What is a Fulcrum?
The place where the lever pivots. This changes the direction of the force.
What is force/effort?
Force is the push and pull (movement) of a load.
Force can be slow, stop, or change the direction of a load.
What are Gears?
Wheels with teeth that fit together (Like a puzzle).
When one gear turns on the other.
Each gear is a different size.
Smaller ones turn more quickly, with less force.
Bigger ones turn more slowly, with more force.
Help increase the power of a turning force.
What are gears?
Wheels with teeth that fit together (Like puzzle).
When one gear turns on the other.
Each gear are different sizes.
Smaller ones turn more quickly, with less force.
Bigger ones turn more slowly, with more force.
Help increase the power of a turning force.
A Simple Machine you can ride?
Wheel and Axles
What is Force/Effort?
The force moving the load.
Ex. Person pushing the person up on a seesaw.
What does Gravity do?
Keeps everything on the ground.
Ex. If I jump I always come back down.
What is an Axle?
An axle is a rod or shaft that rotates the wheels and supports the weight.
What does Gravity do?
Gravity is a force that pulls all load on earth down.
What is a simple machine that you pull?
Pulley
What is a Beam?
Is a structural element that primarily resists loads.
It does not bend.
It goes up and down.
How does distance and force work together?
Name a machine that has wheels and axles?
- Cars
- Wheel Chairs
-Pizza Cutter
Name Machines that use pulleys?