equations

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Geography

9th

23 Terms

1
Weight (w)
Mass x gravitational field strength (m g)
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2
Work done (W)
force (F) x distance (along the line of action of the force)
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3
Force applied to a spring (F)
Spring constant x extension (k e)
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4
moment of a force (M)
Force x distance (normal to the direction of the force) (F d)
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5
Pressure (P)
force normal to a surface (F) divided by the area of that surface (a)
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6
Distance travelled (S)
Speed (v) x time (t)
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7
acceleration (a)
change in velocity (Δ v)/time taken (t)
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8
resultant force (F)
mass (m) x acceleration (a)
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9
momentum (p)
mass (m) x velocity (v)
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10
Kinetic energy (E,K)
0.5 (1/2) x mass (m)x speed2 (v2)
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11
gravitational potential energy (Ep)
mass (m) x gravitational field strength (g) x height (h)
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12
power (P) (1)
energy (E)/time(t)
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13
power (P) (2)
work done(w)/time(t)
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14
Efficiency (2)
Useful power output / total power input
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15
Efficiency (1)
Useful output energy transfer / total input energy transfer
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16
wave speed (v)
frequency (f) x wavelength (λ)
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17
charge flow (Q)
Current (I) x time (t)
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18
Potential difference(v)
current (I)x resistance(R)
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19
Power (P) (1)
potential difference (V) x current (I)
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20
Power (P) (2)
current2 (I2)x resistance(R)
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21
energy transferred (E) (1)
Power (P) x time (t)
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22
Energy transferred (E) (2)
charge flow (Q) x potential difference (V)
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23
Density (p)
mass (m) / volume (v)
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