1. Rube Goldberg Project

9. Rube Goldberg Paper Detail the energy transfers involved
Discuss the simple machines used
Include important design or production ideas
Include any physics concepts you had to consider while completing the machine
Not a description of the steps, rather a topical discussion of the physics involved.

10. Energy Transfers
For the Rube Goldberg machine to work, energy must be transferred from the beginning to the end.
Types of energy
Gravitational potential - Chemical
Elastic potential - Electrical
Kinetic Thermal
Linear Rotational

11. Energy Transfers
Potential to kinetic
Ball rolling down a ramp

12. Energy Transfers
Elastic to kinetic
Slingshot propelling a marble

13. Energy Transfers Linear to rotational
Ball falling into basket connected to pulley

15. A bar supported at a single point called the fulcrum.
Position of the fulcrum changes the mechanical advantage.
Manipulate the position of the fulcrum.

16. WHEEL & AXLE
Any large disk (the wheel) attached to a small diameter shaft or rod (the axle)
Can give you mechanical advantage.
Example: Turning a screw with a screwdriver

17. Any rope or cable looped around a support.
Example: A rope thrown over a branch to hoist something into the air.
Often incorporates a wheel and axle system to reduce the friction on the rope and the support.
Gives mechanical advantage

18. A ramp
Allows you to exert less force at the price of a longer distance
Same amount of work done, just seems easier because less force is needed.

19. Two inclined planes placed back to back
May be forced into an object to prevent it from moving or to split it into pieces.
Example: A knife

20. An inclined plane wrapped around a cone
Can be used to move a load (like a corkscrew jack)
Used to fasten objects together because of the great forces screws can exert

21. Complex Machines Derived from simple machines
Combination and adaptation of simple machines

22. Mechanical Advantage Simple machines can provide MA.
Ratio of output force to input force.
MA = Output force = Input distance
Input force Output distance

23. Efficiency Real machines have friction Energy is dissipated as heat
Never 100% efficient
% Efficiency = Output work x 100%
Input work