formulas

Question 1

speed?

Answer 1

speed (m/s)= distance (m) / time (s)
(v=x/t)

Question 2

wave speed?

Answer 2

wave speed (m/s)= frequency (Hz) x wavelength (m)
(v=fh)

Question 3

force exerted on a spring?

Answer 3

force exerted on a sprint (N) = spring constant (N/m) x extension (m)
(F= k x)

Question 4

energy transferred in stretching?

Answer 4

energy transferred in stretching (J)= 0.5 x spring constant (N/m) x extension^2 (m^2)
(E= 1/2kx^2)

Question 5

velocity?

Answer 5

velocity= displacement/ time
(x/t or s/t)

Question 6

density?

Answer 6

density= mass/volume

Question 7

velocity and braking distance

Answer 7

v(velocity) —>d braking (braking distance) x 4
(velocity —> braking distance x 4)
worth 3 marks in exam