formulas

Question 1

Speed

Answer 1

=Distance/time

Question 2

Acceleration

Answer 2

=Change in speed/time taken

Question 3

Weight(N)

Answer 3

=Mass(kg)x gravitational field

Question 4

Density(kg/m^3)

Answer 4

=mass/volume

Question 5

Hooke’s Law(N)

Answer 5

=Spring constant(N/M) x extension(m)

Question 6

Newton’s second law

Answer 6

=mass x acceleration

Question 7

Pressure(Pa)

Answer 7

=Force/Area

Question 8

Work done

Answer 8

=Force x distance

Question 9

Kinetic energy

Answer 9

=1/2 mass x velocity^2

Question 10

Gravitational Potential Energy

Answer 10

=mass x gravitational field x height

Question 11

Power (W)

Answer 11

=Energy/time

Question 12

Efficiency (%)

Answer 12

= Useful Energy outupt/ total energy input x 100 (%)

Question 13

Wave speed

Answer 13

= frequency x wavelength

Question 14

Reflection

Answer 14

angle of incidence = angle of refraction

Question 15

Refraction

Answer 15

= sin (incidence)/ sin (refraction)= refractive index

Question 16

Speed of light

Answer 16

= 3.0 x 10^8

Question 17

Human hearing range

Answer 17

20-20,000hz

Question 18

Current (A)

Answer 18

=Charge/time

Question 19

Resistance (ohms)

Answer 19

=voltage/current

Question 20

Power(W)

Answer 20

=voltage x current

Question 21

Energy (J)

Answer 21

=voltage x current x time

Question 22

Transformers

Answer 22

=voltage in primary coil/ voltage in secondary coil= number of primary coils/ number of secondary coils