Simple Machines
What is a simple machine?
a tool with few parts that makes work easier
What is work?
when an object changes position by moving in the direction of the force that is applied
What is a lever?
a simple machine that consists of a bar that moves around a fixed point
Name three different simple machines.
lever, pulley, screw, inclined plane, wedge, wheel and axle, etc.
In calculating work, force is measured in?
Newtons
What kind of simple machine is a broom?
lever
What is the metric unit for work?
Joule
What is a fulcrum?
a fixed point where a lever rotates
Give an example of how a wedge would be used.
doorstop, teeth, etc
How much work is done in moving a box 100 meters, using a force of 3 newtons?
300 Joules
Name 3 things that uses a pulley.
well, workout machines, etc
What is the formula for calculating force?
Work = Force x Distance
What kind of lever has the fulcrum in the middle? AND give an example
first class lever, seesaw
What is a screw?
an inclined plane wrapped around a rod
A newton-meter is also called a ,,,?
Joule
What kind of simple machine is a doorknob?
wheel and axle
How much work is done by moving a box 12 meters with a force of 20 Newtons?
240 Joules
Give an example of a second class lever.
wheelbarrow, paper cutter, nutcrackers
What kind of simple machine is a wheelchair ramp? Give another example of this simple machine
inclined plane
What is a pulley?
made up of a rope or chain wrapped around a wheel
Give an example of a compound machine
bike
If 300 Joules of work was done to move an object with a force of 30 newtons, how far was the object moved?
10 meters
Name the difference between all three types of levers.
first class lever - fulcrum in the middle
second class lever - fulcrum at the end, resistance in the middle
third class lever - fulcrum at the end, effort force in the middle
What is a compound machine?
An object that consists of many simple machines
Name three simple machines in a bike.
wheel and axle, pulley, lever