what is a machine called that uses two or more simple machines?
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What is a machine called that uses two or more simple machines?. Compound machine. What class of lever is a pair of scissors?. 1 st class Resistance - fulcrum - effort. What class of lever is a fishing pole?. 3rd class Fulcrum – effort - resistance. What class of lever is a nutcracker?. - PowerPoint PPT PresentationTRANSCRIPT
What is a machine called that uses two or more simple machines?Compound machine
What class of lever is a pair of scissors?
1st class
Resistance - fulcrum - effort
What class of lever is a fishing pole?
3rd classFulcrum – effort - resistance
What class of lever is a nutcracker?
2nd classFulcrum – resistance - effort
What class of lever is a pair of pliers?
1st classResistance – fulcrum - effort
Define Actual Mechanical Advantage
Mechanical advantage is the number of times a machine multiples the effort force
How do you determine the mechanical advantage of a pulley system?Count the number of supporting strands or pulleys
What are the 2 types of mechanical advantage?
Ideal
Actual
What is the mechanical advantage of a fixed pulley?1.
There is no advantage. A fixed pulley only changes direction
Give an example of a compound machine
car
Name the 6 simple machines
Wedge
Screw
Inclined plane
Pulley
Wheel and axle
Lever
What is the force applied by a machine called?
Load force
What is another name for an inclined plane wrapped around a cylinder?
screw
What is another name for 2 inclined planes put together?
wedge
What causes simple machines to become inefficient?
friction
When calculating IMA, what is being measured?
Distance:
effort & load
When calculating AMA, what is being measured?
Force:
effort & load
What is the work done without the use of a machine called?
Output work
What is the work you do on a machine called?
Input work
How is input work calculated?
Effort force multiplied by effort distance
The output work of a machine is 2700 joules and the input work of the machine is 5400 joules
What is the efficiency of this machine?Eff = ow / iw
2700 / 5400 = 50 percent
120 newtons3 meters
105 newtons5 meters
What is the load distance?3 meters
120 newtons3 meters
105 newtons5 meters
What is the effort force?105 newtons
120 newtons3 meters
105 newtons5 meters
What is the output work?120 X 3 = 360 joules
120 newtons3 meters
105 newtons5 meters
What is the input work?105 x 5 = 525 joules
120 newtons3 meters
105 newtons5 meters
What is the efficiency?360 / 525 = 69%
120 newtons3 meters
105 newtons5 meters
What is the IMA?Ed / Ld 5 / 3 = 1.67
120 newtons3 meters
105 newtons5 meters
What is the AMA?Lf / Ef 120 / 105 = 1.14
120 newtons3 meters
105 newtons5 meters
By using this inclined plane, how much more work will be needed to lift this load? (IW - OW) 525 - 360 = 165 joules
120 newtons3 meters
105 newtons5 meters
If it takes more work to use this inclined plane, then why use it?It’s easier (requires less force) to use although you need to travel a longer distance.
120 newtons3 meters
105 newtons5 meters
What is the slope? a² + b² = c² 3² + ? = 5² ? = 4 (run) 3 / 4 = .75 (slope)