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Physics > Equation cards > Flashcards

Equation cards Flashcards

1
Q

Vectors - Resolving a force into its horizontal component?

A

Fx=Fcosθ

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2
Q

Vectors - Resolving a force into its vertical component?

A

Fy=Fsinθ

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3
Q

Suvat equation beginning with v?

A

v = u + at

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4
Q

Suvat equation beginning with s, and using v?

A

s = 1/2 ( u + v ) t

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5
Q

Suvat equation beginning with s, using a?

A

s = ut + 1/2 at^2

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6
Q

Suvat equation beginning with v^2?

A

v^2 = u^2 = 2as

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7
Q

Extra suvat equation, without u in it?

A

s = vt - 1/2 at^2

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8
Q

Rules for using suvat?

A

Constant acceleration, moving in a straight line

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9
Q

What do the symbols stand for in suvat?

A 
s=displacement
u=initial velocity
v=final velocity
a=acceleration
t=time taken for the change in velocity
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10
Q

Equation for force?

A

force = mass x acceleration

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11
Q

Equation for weight?

A

weight = mass x gravity

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12
Q

Force equation using momentum?

A

force = change in momentum/change in time

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13
Q

Momentum equation?

A

momentum = mass x velocity

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14
Q

Power/energy efficiency equation?

A

useful output energy/total input energy ( x 100% )

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15
Q

What is the moment of a force?

A

moment = force x perpendicular distance of the line of action of force from the axis or point of rotation

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16
Q

What is the torque of a force?

A

torque = one of the forces x perpendicular separation between the forces

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17
Q

Density equation?

A

density = mass/volume

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18
Q

Pressure equation?

A

pressure = force/area

19
Q

Pressure in liquids equation?

A

pressure = height of the liquid column x density of the liquid x gravity

20
Q

Work done equation?

A

work done = force x distance moved in direction of the force

21
Q

Work done equation using an angle?

A

work done = F x cos θ

22
Q

Power equation?

A

Power = work done/ time taken

23
Q

Power equation using speed?

A

Power = force x speed

24
Q

Restoring force exerted by the spring on that end?

A

Force = the spring constant x the displacement of the springs end from its equilibrium position

25
Q

Energy for springs using force?

A

Energy = 0.5 x force applied x the extension

26
Q

Energy for springs using the spring constant?

A

Energy = 0.5 x spring constant x extension^2

27
Q

Stress equation?

A

Force load/area

28
Q

Strain?

A

extension/length

29
Q

Young modulus?

A

stress/strain

30
Q

Charge?

A

Change in charge = current x change in time

31
Q

Current?

A

current = cross-sectional area x number density x charge of electrons x mean drift velocity

32
Q

Work done?

A

work done = voltage x charge

therefore, WD = EMF x charge

33
Q

Work done, representing Q in a different form?

A

WD = V x I x t

34
Q

Resistance equation, involving resistivity?

A

Resistance = resistivity x length / area

35
Q

Resistance in series?

A

R = R1 + R2 …

36
Q

Resistance in parallel?

A

1/R = 1/R1 + 1/R2 …

37
Q

Power equation, with v?

A

Power = voltage x current

38
Q

Power equation, with r?

A

Power = current^2 x resistance

39
Q

Power equation, with both v and r?

A

Power = voltage^2 / resistance

40
Q

Equation for internal resistance, without v?

A

EMF = current x ( resistance x internal resistance)
therefore,
EMF = voltage + (current x internal resistance)

41
Q

Voltage equation, simple form?

A

Voltage = current x resistance

42
Q

What actually is EMF?

A

The potential difference across a cell, when delivering no current

43
Q

Definition of EMF?

A

Electromotive force = the energy transferred from some other form into electrical energy per unit charge

Physics (10 decks)

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