Simple Machines 1
Machines with many parts are called
Complex machines
What does it mean when a pulley has a mechanical advantage of 1?
You must apply the same force to the one end of the rope.
A wheel is really a kind of what?
lever
An inclined plane with a long surface will have a ________ angle of incline?
The job will be _____________.
small
easier
What are the differences between a unbalanced force and a balanced force.
When a force is balanced, there is no movement.
When a force is unbalance, there is movement.
What are the basic simple machines
Pulleys, levers, wedges, inclined planes, wheel and axle and screws
When are levers most often used
To lift and move loads
How come the use of the wheel as the best way to travel did not catch on quickly?
People needed to train horses to pull wagons and they had to build roads.
Name 3 wedges that exist in nature?
teeth
nails
claws
Name a surface with high friction.
rubber, carpet, grass, sand....
Name 3 things a wedge can do?
Grate
Dig
Cut
Sharpen
Where and for what would you find a pulley?
In a house, the blinds for the window.
Draw and label 1 example of a wheel and axle used in ancient times
Clay pot maker
Give 4 examples of an inclined plane used on the job, in sports or everyday life.
hills
ramps
escalators
stairs
What makes an object move?
unbalanced force
What does a lever move up and down on
Fulcrum
Provide two examples of an inclined plane.
Examples: slide on playground; handicapped ramp; a ladder; a roller coaster ride (track).
What does horizontal mean?
The flat base of a triangle. Left to right
A screw is a tool that ________ things together.
holds
What is a force
A puh or pull.
Forces start or stop objects moving, change the speed or direction of objects,change the shape of objects
Draw or demonstrate a First class lever
Fulcrum is in the middle load and effort on each side.
Draw or demonstrate a second class lever
Examples: Sweeping using a broom; standing on tip toes; flexing elbow or knee joints, etc.
Distance from the base to the top. Up and down
What happens when 2 or more pulleys are used together?
It multiplies the force to make it 2 times easier.
What is gravity
The force that pulls an object towards the center of the earth