Inclined Planes
These are a specialized version of an inclined plane, wrapped around a nail.
What is a screw?
The unit of measure for work
What is a joule?
Two examples of pulleys.
What are blinds, sail on sailboat, water well, etc? (answers will vary)
The fixed point the lever pivots on; where the lever touches
What is a fulcrum?
The efficiency formula.
What is output work divided by input work x 100%
To make a ramp more efficient, you should make it longer and less of this.
What is steep? (high)
In order for work to occur, a force and ___?____ has to occur **note: sliding does not count
What is distance or displacement? (movement)
The pulley system that results in the least amount of effort force. 1 pulley, 2 pulleys or 3 pulleys.
What is a 3 pulley system?
Levers _________ the force needed to lift a boulder, and change the __________ of the force.
What is decrease and direction?
The efficiency of a machine that has output work of 1,000 J and an input work of 4,000 J.
What is 25%?
An inclined plane makes work easier by reducing the amount of force needed, but it increases this.
What is distance?
The formula for calculating work.
What is work = force x distance
Pulleys make work easier by decreasing the amount of force needed and changing this
Class of lever where the effort lies between the fulcrum and the load. (FEL or LEF)
What is class 3 lever?
What is gas mileage? **miles per gallon or kilometers per liter.
What is a smooth surface?
If you push against a wall and it does not move, this is the amount of work you have done.
What is zero (none)?
How a pulley makes work easier to lift a sail on a sailboat by changing the direction of the force to work with your body weight and ___?______.
What is gravity?
Class of lever where the fulcrum lies between the load and effort. (LFE or EFL)
What is class 1 lever?
To make a lever more efficient, you can change the _______ of the lever.
What is the material (composition)?
Two examples of an inclined plane.
What are wheel chair ramp, slide, etc. *answers will vary.
A person uses 85 Newtons of force to lift a child who weighs 7 kg (15.43 lbs) up a ramp to the ferris wheel that is 5 meters in length and 2 meters high off the ground. The amount of work done is....
***Note - some of this information you won't need
What is 425 Joules?
Work = force x distance
Work = 85 N x 5 m
Adding oil to a pulley system reduces ___?____, in order to make it more efficient.
What is friction?
The class of lever in which the load lies between the fulcrum and the effort. (FLE or ELF)
What is a class 2 lever?
The efficiency of a machine if 4,000 J of energy results in 800 J of work.
What is 20%?