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Physics > Energy, Power And Work And Force > Flashcards

Energy, Power And Work And Force Flashcards

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1
Q

What is potential energy and how do you calculate it

A

Potential energy is the energy a body possesses because of its position or state

mgh

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2
Q

What is kinetic energy and how do you calculate it?

A

Kinetic energy is the energy a body possesses because of its motion

KE = 1/2 mv^2

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3
Q

How do you calculate the change from PE to KE

A

Find the potential energy and that = the kinetic energy so if the potential energy was 4000 it would be
KE = 4000
4000 = 1/2 mv^2

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4
Q

What is a force?

A

A push or pull measured in newtons

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5
Q

What is weight?

A

Downward pull of gravity on body

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6
Q

What is Tension

A

The force when an object is being stretched

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7
Q

What is friction?

A

A force that stops objects

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8
Q

What is Newton’s first law?

A

An object won’t change its motion unless a force acts on it

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9
Q

What is Newton’s second law?

A

The force on an object is equal to its mass times acceleration

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10
Q

What is Newton’s third law?

A

When two objects interact they apply forces to each other of equal but opposite direction

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11
Q

How do you calculate force?

A

Force = m x a if it is vertical
Force = m x g if it is horizontal

If gravity is not given it is 10

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12
Q

What is the mass of an object?

A

The amount of matter it contains

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13
Q

What is weight

A

The pull of a body caused by gravity

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14
Q

How do you calculate weight?

A

Weight = mass x gravity

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15
Q

What is a stable equilibrium?

A

It returns to its original position.

It is drawn as the bottom half of a semi circle with an object in the middle

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16
Q

What is neutral equilibrium?

A

When a body has no tendency to return to its original position or move further away.

17
Q

What is and How do you draw unstable equilibrium?

A

An object that moves further away from its original position

You draw it with a top half of a semi circle and an object on top. If it’s a bottle it goes upside down

18
Q

What is energy?

A

The capacity to perform work

19
Q

What are the types of energy?

A

Heat, electrical, potential, kinetic, chemical, sound, nuclear, light, mechanical and magnetic.

Hey everyone Peter killed Carl and Sam near limegrove Monday morning

20
Q

What are environmental friendly energy sources?

A

Solar, wind, geothermal energy and waves

21
Q

What are energy converters?

A

When appliances change from one form to another

22
Q

What are the energy’s used in a car

A

Chemical —> Mechanical —> Kinetic + Heat

23
Q

What are the energy conversions in a lightbulb

A

Electrical —> Light + Heat

24
Q

What are the energy conversions of a television?

A

Electrical —> light + sound + heat

25
Q

What are the energy conversions of a tractor?

A

Chemical energy —> kinetic + sound + heat energy

26
Q

What is the energy of photosynthesis?

A

Light —> chemical

27
Q

What are 4 ways to conserve energy?

A

Turn off light when not being used, unplug appliances that are not being used, do not leave the fridge door open and energy efficient engines burn less fuel

28
Q

What is the problem with fossil fuels?

A

A lot of money is spent on fossil fuels

29
Q

What is work?

A

Work is done whenever an object is moved by force

30
Q

How do you calculate work?

A

Work = force x distance

31
Q

What is the unit of work?

A

Joule J

32
Q

What is power?

A

Power is the rate of doing work

33
Q

How do you calculate power

A

Power = work/time

34
Q

What is the unit of power?

A

Watts W

35
Q

How do you calculate the resultant force?

A

If there are two on the same side add them, if there are two on different sides take the largest away from the smallest and the largest is the direction your answer goes in, and if they are the same on both sides it is equal

36
Q

What kind of Quantity is
Force?

A

A vector quantity

37
Q

What a Vector quantity?

A

A quantity that has Magnitude
& Direction

Physics (5 decks)

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