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Physics: Energy, Work and Simple Machines Flashcards

1
Q

Efficiency

A

can be calculated by comparing a machine’s output work to its input work

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2
Q

Machine

A

A device that changed the magnitude or direction of a force

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3
Q

Compound Machine

A

Consists of two or more simple machines linked so that the resistance force of one machine becomes the effort force of the second machine

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4
Q

Resistance Force

A

The force exerted by a machine

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5
Q

Watt

A

A unit of power defined as 1 joule per second

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6
Q

Effort Force

A

The force exerted by a person on a machine

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7
Q

Work-energy theorem

A

States that the work done on an object equals the change in kinetic energy of the object

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8
Q

Energy

A

The ability of an object to produce a change in itself or its surroundings

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9
Q

Kinetic energy

A

The energy that results from the motion of an object

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10
Q

Power

A

The rate of doing work

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11
Q

Mechanical advatage

A

The ratio of resistance force of a machine to its effort force

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12
Q

Joule

A

The SI unit for work

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13
Q

Ideal Mechanical Advantage

A

To calculate you compare the effort distance to the resistance distance

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14
Q

Work

A

When an applied force is multiplied by the distance through which the force is applied

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15
Q

Equation for finding work

A

W=fd

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16
Q

Work and energy are measured in

A

Joules

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17
Q

Explain the relationship between work and energy

A

They’re equal according to the work-energy theorem

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18
Q

Equation for finding power

A

w/t

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19
Q

Power

A

the rate of energy transfer

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20
Q

In what unit is work measured in

A

joules

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21
Q

In what unit is power measured in

A

watts

22
Q

If an area has flowing water and has money to build a dam to connect it to the electricity grid, then they can use this form of renewable energy

A

Hydroelectric

23
Q

This type of energy is produced when electricity generators are placed on the surface of the ocean. The energy provided is most often used in desalination plants, power planes, and water pumps

A

Waves

24
Q

This type of energy is created by hot spots; areas where earth’s core heat comes to surface

A

Hydrothermal and Geothermal

25
Q

This source is often compared compared to batteries; both convert the energy produced by a chemical reaction into usable electric power

A

Hydrogen Fuel Cells

26
Q

This source of energy is used for powering low voltage devices that are not used often. Its life and endurance is dependent on the apparatus it will energize an the chemical agten involved in its makeup.

A

Conventional Batteries

27
Q

This type of energy is used throughout areas of the Midwest and in the southern regions of the US and can be a way to generate power to large areas in a fairly inexpensive way.

A

Wind turbines/generators

28
Q

This source can be made from scraps of plants, grain, wood, and other types of biological material; it converts a solid to a liquid form to use instead of gas in vehicles

A

Biomass

29
Q

This type of energy relies on steller energy; splitting of heavy atoms and the combining of lighter oens

A

Nuclear energy

30
Q

Converting landfill hasses into a source of renewable energy is beneficial because it reduced greenhouse gas emissions and can generate revenue from the sale of the electricity

A

Indirect Natural Gas

31
Q

This type of energy is significant because our society uses large amounts of it and it depends on the use of power plants that convert some other kind of energy into it

A

Standard Electrical Power

32
Q

This device absorbs light energy from the sun and converts it into usable forms of energy

A

Solar Cells

33
Q

A bone is like a

A

lever

34
Q

A muscle contraction is like a

A

force

35
Q

Joints are like

A

the fulcrum

36
Q

The resistance is like

A

the weight of body or lifted object

37
Q

Two inclined planes placed back to back

A

wedge

38
Q

A circular lever that consists of a grooved wheel rotating about a hub

A

pulley

39
Q

any slanting surface

A

inclined plane

40
Q

an inclined plane wrapped around a cylinder

A

screw

41
Q

A fixed wheel turning on a rod through its center

A

wheel and axle

42
Q

A rigid bar that rotates on a pivot called a fulcrum

A

levers

43
Q

First class lever

A

FUlcrum is in the middle (EFL) seesaw, hammer removing nail

44
Q

Second class lever

A

the load is in the middle (ELF) paper cutter

45
Q

Third class lever

A

the effort is in the middle (FEL) rake

46
Q

WHy is gasoline called a “miracle” in the film

A

can go far with little amount easily refilled, cheap

47
Q

WHat makes electric cars still exesnive

A

Batteries are expensive

48
Q

What are 2 major advantages of natural gas as an energy source compared to the other fossil fuels

A

Natural gas is less expensive, environmentally friendly, burns cleaner

49
Q

Do you think nuclear power is a safe form of energy

A

Yes, it has gotten a lot safer, they’re more secure and can withstand drastic weather

50
Q

What does the film say that you and I do to help the global energy demand

A

Suggest nuclear, natural gas, and renewable energy can be combined to see 50 year crossover

51
Q

Why is the documentary called “Switch?”

A

They’re looking to switch old energy sourced to more environmental and future friendly

52
Q

What are two factors that can influence the price of any type of energy

A

Supple and demand, natural disasters

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