Physics Flashcards

1
Q

Speed (m/s)

A

distance (m) / time (s)

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2
Q

Acceleration (m/s^2)

A

change in velocity (m/s) / time (s)

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3
Q

Force (N)

A

mass (kg) x acceleration (m/s^2)

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4
Q

Weight (N)

A

mass (kg) x gravitational field strength (N/kg)

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5
Q

Efficiency

A

useful energy (J) / total energy (J)

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6
Q

Momentum

A

mass (kg) x velocity (m/s)

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7
Q

Wave speed (m/s)

A

frequency (Hz) x wavelength (m)
or
distance (m) / time (s)

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8
Q

Density (kg/m^3)

A

mass (kg) / volume (m^3)

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9
Q

Work done (J)

A

force (N) x distance (m)

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10
Q

Change in GPE (J/kg)

A

mass (kg) x gravitational field strength (N/kg) x change in vertical height (m)

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11
Q

Kinetic energy (J)

A

1/2 x mass (kg) x (speed (m/s))^2

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12
Q

Power (W)

A
work done (J) / time (s)   
or
energy transferred (J) / time (s)
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13
Q

Energy transferred (J)

A

charge moved (C) x voltage (V)

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14
Q

Charge (C)

A

current (A) x time (s)

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15
Q

Voltage (V)

A

current (A) x resistance (Ω)

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16
Q

Electrical power (W)

A

current (A) x voltage (V)
or
(current (A))^2 x resistance (Ω)

17
Q

Force exerted on spring (N)

A

spring constant x extension (m)

18
Q

Moment of a force (Nm)

A

force (N) x distance normal to the direction of the force (m)

19
Q

Pressure (Pa)

A

force normal to surface (N) / area of that surface (m^2)