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BMAT Physics > ENERGY AND WORK > Flashcards

ENERGY AND WORK Flashcards

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1
Q

what is energy

A

capacity for doing work.

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2
Q

what is kinetic energy

A

energy possessed by a moving object due to its motion

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3
Q

what is the kinetic energy equation

A

KE = 1/2 mv^2

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4
Q

what is potential energy

A

stored energy of position possessed by an object

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5
Q

what are the three important types of potential energy

A

gravitational potential energy
elastic potential energy
electric potential energy

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6
Q

what is gravitational potential energy

A

energy derived from the force of gravity

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7
Q

what is the equation for gravitational energy

A

Ep = mgh

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8
Q

break down the gravitational potential energy equation

A

m = mass
h = height
g = 9.8m/s2

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9
Q

does a brick on the ground have gravitational potential energy

A

no

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10
Q

does someone holding a brick in the air have gravitational potential energy

A

yes

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11
Q

what is elastic potential energy

A

energy stored in elastic materials as a result of their
compressing or stretching

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12
Q

what is the elastic potential energy equation

A

Ep = kx^2/2

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13
Q

break down the elastic potential energy equation

A

k = spring constant
x = displacement of spring (amount of compression)

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14
Q

where can elastic potential energy be stored

A

in rubber bands and compression springs

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15
Q

what is electric potential energy

A

energy that results from Coulomb forces associated with point charges within a defined system

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16
Q

what is the equation for electric potential energy

A

Ep = k x q1 x q2/r

17
Q

breakdown the electric potential energy equation

A

k = 8.99 x 19 NM2/C2
q1 and q2 are charges
r = distance between two charges

18
Q

what is the coloumb constant

A

k = 8.99 x 19 NM2/C2

19
Q

why is a negative sign assigned to electric potential energy answers

A

there is an attractive force between them.

20
Q

what is work

A

transfer of energy by a force

21
Q

all work is also equated to what

A

all work is energy transfer.

22
Q

what is work measured in

A

joules

23
Q

what is the equation calculating the amount of work produced by a force

A

Work = F.d.cosθ

24
Q

what is energy and work measured in

A

Both energy and work are measured in joules

25
Q

how is 1J of work equal to in energy

A

1 J = 1N x 1m

26
Q

what is mechanical energy

A

sum of the kinetic energy (Ek) and potential energy (Ep)

27
Q

what is the mechanical energy equation

A

ET = Ep + Ek

28
Q

describe ep and ek in an isolated system

A

sum of the kinetic and potential energy will remain the same, although the kinetic energy and potential energy may vary

29
Q

what is power

A

rate at which work is done

30
Q

what is power units

A

watts

31
Q

what is watts also equal to

A

joules/second (J/S).

32
Q

what is the power equation

A

p = w/t

work/time
work is joules
time is seconds

BMAT Physics (12 decks)

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