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Slide 1

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Useful formulae
Try to find time to remember these
and their units for your test. You need
to know units more often, but don't
get caught out!…read more

Slide 2

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Slide 3

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Momentum (kg m/s) = mass (kg) x velocity (m/s)
Units are kilogram metres per second (kg m/s) or newton seconds (Ns). We can show
that the units are the same.…read more

Slide 4

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Calculate the kinetic energy of a body using the equation:.
kinetic energy = ½ × mass × speed²
(joule, J) (kilogram, kg) ((metre/second)², (m/s) ²)
Momentum, mass and velocity are related by the equation:
momentum = mass × velocity
(kilogram metre/second, kg m/s) (kilogram, kg) (metre/second, m/s)
Force, change in momentum and time taken for the change are related by the equation:
force change in momentum (kilogram metre/second, kg(m/s))
(newton, N) =
time taken for the change (second, s)
Potential difference, current and resistance are related by the equation:
potential difference = current × resistance
(volt, V) (ampere, A) (ohm, )…read more

Slide 5

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The rate at which energy is transformed in a device is called the power.
power = energy transformed (joule, J)
(watt, W) time (second, s)
Power, potential difference and current are related by the equation:
power = current × potential difference
(watt, W) (ampere, A) (volt, V)
Energy transformed, potential difference and charge are related by the equation:
energy transformed = potential difference × charge
(joule, J) (volt, V) (coulomb, C)
Amount of charge flowing in an electrical circuit:
charge = current × time
(coulomb, C) (ampere, A) (second, s)
Nuclear fission is the splitting of atomic nuclei and is used in nuclear reactors as a
source of heat energy which can be transformed to electrical energy.
Nuclear fusion is the joining together of atomic nuclei and is the process by which energy is
released in stars.…read more





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