what is a machine called that uses two or more simple machines?

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)