Forces, Work, and Energy
Mechanical Advantage
Mechanical Efficiency
Ergonomics
Inclined Planes and Levers
100
an activity involving a force and movement in the directon of the force.
What is work?
100
The ratio of the force produced by a machine to the force applied to it, used in the performance of a machine.
What is mechanical advantage?
100
The amount of work you get out of a machine.
What is work output?
100
By adding cushioning to a chair.
How could you improve the comfort of a chair?
100
Because of friction.
Why is the efficiency of a lever/inclined plane always less than 100%
200
the capacity for doing work. You must have ______ to accomplish work
What is energy
200
Output- 10N Input- 10N
What is the output and input force for a mechanical advantage of 1
200
Adding a lubricant such as grease or oil.
How can you improve the efficiency of a machine?
200
Add padding to the pencil.
How could you make the pencil more comfortable to prevent writers bump?
200
First class, second class, and third class.
What are the three different types of levers?
300
A _____ is a push or pull upon an object resulting from the object's interaction with another object.
What is force
300
Output- 800N Input- 40N
What is the output and input force for a mechanical advantage of 20?
300
Because some of the input work is used to compensate for the work done by friction.
Why is the efficiency of a machine always less than 100%
300
Because the old keyboards were steep and that caused carpal tunnel syndrome.
Why did they create the new keyboard style for computers?
300
A. Load arm B. Fulcrum C. Effort arm
Name the labeled parts on the diagram.
400
Potential Energy to Kinetic Energy?
A stopped car starting to move.
400
Output- 600N Input- 100N
What is the mechanical advantage of 6?
400
Work output/ work input x 100%
How do you find mechanical efficiency
400
Because the ones at home are taller and have more support and cushion then the ones at school.
How are the school chairs better than your chairs at home?
400
A lever has less surface area rubbing together so therefore there is less friction.
What is the advantage of using a lever rather than using a ramp?
500
The force that attracts humans and other objects to the Earth
What is Gravity
500
Input- 2200N Output- 100N
What is the output and input force for a mechanical advantage of 22?
500
An incandescent lamp, which operates at 175 degrees c. Only 5% of the electrical energy is transformed into light energy but compact fluorescent lamps are designed to operate at a much lower temperature.
Example of how you can improve the efficiency of a lamp.
500
By adding cushioning to the sole.
How can you improve the comfort of shoes?
500
You could add lubricants, sand the surface, or add wheels.
What are two ways that you could reduce friction?
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