Equations Flashcards
1
Q
Equations for acceleration
A
a = (v-u) / t
acceleration = change in velocity / time taken
2
Q
Equation for force
A
- F = m x a
3
Q
Weight
A
W = m x g
weight = mass x gravitational field strength
4
Q
Efficiency
A
Efficiency = (useful energy transferred by device) / (total energy supplied to the device)
5
Q
Momentum
A
p = m x v
momentum = mass x velocity
6
Q
Wave speed (2)
A
- v = f x lambda
- wavespeed = frequency x wavelength
- v = x / t
- wavespeed = distance over time
7
Q
Density
A
- p = m / V
- density = mass / volume
8
Q
Work done
A
E = F x d
- work done = force x distance moved in direction of force
9
Q
Change in gravitational potential energy
A
delta GPE = m x g x change in height
10
Q
Kinetic energy
A
KE= 1/2 x m x v^2
1/2 x mass x speed^2
11
Q
Power
A
P = E / t power = work done / time taken
12
Q
Electrical power (2)
A
- P = I x V
- current x potential different
- P = I^2 x R
- current^2 x resistance
13
Q
Force exerted on a spring
A
- F = k x x
- force exerted on a spring = spring constant x extension
14
Q
Current
A
- I = Q / t
Current = charge(coulomb) / time
15
Q
Voltage
A
- V = E / Q
voltage = energy transferred / charge - V = I x R
voltage = current x resistance (ohms)
