Important For Unit 4

Question 1

Efficiency-

Answer 1

Useful work by system:Actual work supplied to system.

Question 2

Input work-

Answer 2

Number of joules going into a machine.

Question 3

Efficiency=

Answer 3

Work done on lever by effort force
X100

Question 4

How is a winch like a lever?

Answer 4

The handle is the effort arm and the axle handle that turns is the load arm.

Question 5

Pascals Law-

Answer 5

Pressure exerted on a contained object is transmitted equally in all directions perpendicular to the surface.

Question 6

Hydraulic lift-

Answer 6

A mechanical system that raises heavy objects on a lift. It is a closed system.

Question 7

Examples of a Hydraulic system-

Answer 7

• Jaws of Life
• Farm Equipment
• Earth movers”diggers”
• Cardio Vascular system

Question 8

Examples of Pneumatic systems-

Answer 8

• Jackhammer
• Dentists Drill
• Staple gun
• Respiratory system

Question 9

Subsystems in a car are…

Answer 9

Combinations of levers and hydraulics.

Question 10

The_____of the piston is attached to_______, which turn the_____.

Answer 10

Rod, gear, paddle wheel.

Question 11

Turbine-

Answer 11

A device used to convert the motion of a fluid into mechanical energy.

Question 12

A turbine consists of…

Answer 12

Fan blades attached to a central hub.

Question 13

Turbines are in…(2)

Answer 13

Jet engines, generating systems.

Question 14

Steam engines require a______,_______, a_______,_______, and__________.

Answer 14

Furnace, boiler, fuel, engine, pistons.

Question 15

Pressure-

Answer 15

The force acting perpendicular to a certain surface area.

Question 16

Subsystem-

Answer 16

A secondary or subordinate system that is part of a larger system.

Question 17

Piston-

Answer 17

A disc-shaped part that fits tightly inside a cylinder in which some force, such as steam pressure, moves it back and forth or up and down.

Question 18

Crankshaft-

Answer 18

A shaft that turns or is turned by a crank. A crank shaft turns the wheels of an automobile.