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Question 1

Equation for density

Answer 1

Density(kg/m cubed)=Mass(kg)/Volume(m cubed)

Question 2

Equation for distance travelled

Answer 2

Distance Travelled(m) = speed(m/s) x time(s)

Question 3

Equation for acceleration

Answer 3

Acceleration(m/s squared) = change in velocity / time(s)

Question 4

Equation for kinetic energy

Answer 4

Kinetic energy(j) =0.5 x mass x velocity(m/s squared) squared

Question 5

Equation for force

Answer 5

Force(N) = mass(kg) x acceleration(m/s squared)

Question 6

Equation for momentum

Answer 6

Momentum(kgm/s) = mass(kg) x velocity(m/s)

Question 7

Equation for work done

Answer 7

Work done(j) = force(N) x distance along the line of action(m)

Question 8

Equation for power

Answer 8

Power(W) = work dome(j) / time(s)

Question 9

Equation for force exerted by a spring(N)

Answer 9

Force exerted by a spring(N)= extension(m) x spring constant(N/m)

Question 10

Equation for gravity force

Answer 10

Gravity force(N) = mass(kg) x gravitational field strength(10N/kg)

Question 11

Equation for gravitational potential energy

Answer 11

Gravitational potential energy(j) = mass(kg) x height(m) x 10(N/kg)

Question 12

Equation for pressure

Answer 12

Pressure(Pa) = force(N) / area(m squared)

Question 13

Equation for Moment of a force

Answer 13

Moment(Nm) = Force(N) x Perpendicular distance(m)

Question 14

Equation for charge flow

Answer 14

Charge flow(c) = current(A) x time(s)

Question 15

Equation for potential difference

Answer 15

Potential difference(V) = current x resistance(ohms)

Question 16

Equation for energy transferred

Answer 16

Energy transferred(j) = charge(C) x potential difference(V)

Or

Power(W) x Time(s)

Question 17

Equation for power

Answer 17

Power(W) = potential difference(V) x current(A) = current squared(A) x resistance(ohms)

Question 18

Equation for wave speed

Answer 18

Wave speed(m/s) = frequency(Hz) x wavelength(m)

Question 19

Equation for efficiency

Answer 19

Efficiency =useful output energy(j)/overall input energy (j)

Question 20

Equation for change in thermal energy

Answer 20

Change in thermal energy(j) =mass(kg) x specific heat capacity(j/kg Celsius) x change in temperature(Celsius)

Question 21

Equation for thermal energy for a change in state

Answer 21

Thermal energy for a change in state(j) = mass(kg) x specific latent heat(j/kg)

Question 22

Equation for constant

Answer 22

Constant = pressure(Pa) x volume(m cubed)

Question 23

Equation for pressure due to a column of liquid

Answer 23

Pressure due to a column of liquid(Pa) = height of column(m) x density of liquid(kg/m cubed) x 10N/kg

Question 24

Equation involving velocity, acceleration and distance

Answer 24

(Final velocity squared - initial velocity squared)= 2 x acceleration x distance

Question 25

Equation for energy transferred in stretching

Answer 25

Energy transferred in stretching(j) = 0.5 x spring constant(N/m) x extension squared(m)

Question 26

Equation for velocity

Answer 26

Change in displacement
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Time