Name that Machine
A modified inclined plane that forms a thin edge
What is a wedge?
A flat surface with one end higher than the other
What is an inclined plane?
The resistance created by two surfaces rubbing together
What is friction?
The unit used to measure work.
What is a joule?
The perimeter of a circle.
What is circumference?
A wheel with teeth.
What is a gear?
Nut cracker, stapler, tweezers, see-saw.
What are examples of levers?
The amount of contact between two surfaces necessary for one surface to travel across the other.
What is traction?
The unit used to measure force.
What is a Newton?
The ability to do work.
What is energy?
A shaft to which one or more wheels is attached.
What is an axle?
A wheel that has a stationary axle.
What is a pulley?
The force that pulls objects towards the center of the Earth.
What is gravity?
The result of a force moving an object over a distance.
What is work?
6 books, 2.5 newtons per book, 1 meter. How many joules?
15 joules
An inclined plane wrapped around a cylinder.
What is a screw?
Sail boat, elevator, cargo lift, crane
What are examples of pulleys?
A substance that reduces friction between two moving surfaces.
What is a lubricant?
Allows us to do work with less effort.
What is mechanical advantage?
The likelihood of an object to stay in motion or to stay still.
What is inertia?
A machine that does work by turning around a fixed point.
What is a lever?
A disk that turns around an axis and transfer force to and from the axle.
What is a wheel?
Why do we need friction?
Can't pick things up.
Everything would slide around.
The world would be dangerous.
17 books, 2.5 newtons per book, 2 meters. How many joules?
85 joules
27 books, 3.5 newtons per book, 2.5 meters. How many joules?
236.25 joules