Equsians Paper 1

Question 1

Equation for distance traveled

Answer 1

distance traveled = average speed × time

Question 2

Equation for acceleration

Answer 2

acceleration = change in velocity ÷ time taken
a = (v − u)/t

Question 3

Equation for force

Answer 3

force = mass × acceleration

F =m×a

Question 4

Equation for weight

Answer 4

weight = mass × gravitational field strength

W =m×g

Question 5

Equation for momentum

Answer 5

momentum = mass × velocity

p=m×v

Question 6

Equation for change in gravitational potential energy

Answer 6

change in gravitational potential energy = mass × gravitational field strength × change in vertical height
∆GPE = m × g × ∆h

Question 7

Equation for kinetic energy

Answer 7

kinetic energy= 1/2×mass×(speed)squared

KE = 1/2 ×m×v

Question 8

Equation for efficiency

Answer 8

efficiency = (useful energy transferred by the device) (total energy supplied to the device)

Question 9

Equations for wave speed

Answer 9

wave speed = frequency × wavelength
v = f ×λ
wave speed = distance ÷ time
v = x/t

Question 10

Equations for work done

Answer 10

work done = force × distance moved in the direction of the force
E=F×d

Question 11

Equations for power

Answer 11

power = work done ÷ time taken
power = energy transferred ÷ time taken
P = Et

Question 12

Equations for moment of force

Answer 12

moment of a force = force × distance normal to the direction of the force

Question 13

Equations for energy transferred

Answer 13

energy transferred = charge moved × potential difference

E =Q×V

Question 14

Equations for charge

Answer 14

charge = current × time

Q=I×t

Question 15

Equations for potential difference

Answer 15

potential difference = current × resistance

V=I×R

Question 16

Equations for electrical power

Answer 16

electrical power = current × potential difference
P = I ×V
electrical power = current squared × resistance
P=I squared×R

Question 17

Equations for density

Answer 17

density = mass ÷ volume
ρ = Vm

Question 18

Equations for force exerted on a spring

Answer 18

force exerted on a spring = spring constant × extension

F=k×x

Question 19

Equations for pressure

Answer 19

pressure = force normal to surface ÷ area of surface
P = FA

Question 20

Equations for change in velocity

Answer 20

(final velocity)squared – (initial velocity)squared= 2 × acceleration × distance
v squared − u squared =2×a×x

Question 21

Equations for force

Answer 21

force = change in momentum ÷ time
F = (mv − mu)/t

Question 22

Equations for energy transferred

Answer 22

energy transferred = current × potential difference × time

E = I ×V ×t

Question 23

Equations for force on a conductor at right angles to a magnetic field carrying a current.

Answer 23

force on a conductor at right angles to a magnetic field carrying a current = magnetic flux density × current × length
F=B×I×l

Question 24

Equations for potential difference potential difference across primary coil / potential difference across secondary coil

Answer 24

potential difference across primary coil / potential difference across secondary coil = number of turns in primary coil / number of turns in secondary coil
Vp=Np Vs Ns

Question 25

Equations for transformers with 100% efficiency, potential difference across primary coil × current in primary coil

Answer 25

for transformers with 100% efficiency, potential difference across primary coil × current in primary coil = potential difference across secondary coil × current in secondary coil
VP×IP =VS×IS

Question 26

Equations for change in thermal energy

Answer 26

change in thermal energy = mass × specific heat capacity × change in temperature
∆Q = m×c×∆θ