Lesson 1
This must happen for work to be done.
Movement
A machine is a tool that makes this easier.
Work
What is a Compound machine?
A machine made up of 2 or more simple machines.
Which is an example of work: pushing a car that does not move OR pulling a wagon that moves?
Pulling a wagon
Work only happens when force and motion are in this relationship.
Moving in the same direction.
Machines change force in these three ways.
size, distance, and direction
This tool has three simple machines: a lever, a wedge, and a screw. What is this tool?
Scissors
Which simple machine is a winding trail up a hill?
Inclined plane
A student holds a heavy object still. How much work is done?
There is no work.
This simple machine is a flat, slanted surface used to move objects upward.
Inclined plane
This machine uses a wheel and axle, a wedge, and a screw.
Hand drill
How much work is done when a 6 N force moves an object 2 meters?
12 Joules
What is this formula, Force multiplied by Distance?
Formula for calculating Work.
This simple machine is used for cutting.
Wedge
Why are compound machines better than simple machines?
They are stronger, faster, and more efficient
Which of the following is a second-class lever: tongs, scissors, or a nutcracker?
Nutcracker
Two students lift the same box, but one is faster. Who has more power and why?
The faster student because power is how fast a work can be done.
Name ALL six simple machines.
Inclined plane, wedge, screw, lever, wheel and axle, pulley
Name at least THREE simple machines found in a bicycle.
Levers, wheel and axle, pulleys, inclined planes, and screws
Which machine contains screws, a lever, a wheel and axle, and wedges?
1. Stapler
2. Pencil sharpener
3. Bicycle
All of the above