Unit 1 Equations

Question 1

What is the equation for speed?

Answer 1

S=D/T

Speed = Distance/Time

Question 2

What is the equation for force in extension of spring?

Answer 2

F = KE

Force = spring constant × extension of spring

N = N/m m

(as long as the limit of proportionality is not exceeded)

Question 3

What is the equation for force or distance? (principle of moments)

Answer 3

CM = ACM

F1 × d1 = F2 × d2

Question 4

What is the equation for density?

Answer 4

D= M/V

Density =mass/volume

kg/m³ kg m³

Question 5

What is the equation for work done?

Answer 5

W.D = F×D

= w × d

Work done= force × distance

= weight × height

Question 6

What is the equation for power (not E=PT or P=IV)

Answer 6

P= W.D. / T

Power = work done / time
(W) (J) (s)

Question 7

What is the equation for resultant force?

Answer 7

R.F. = ma

Resultant force = mass × acceleration

    (N)                      (Kg)      (m/s²)

Question 8

What is the equation for rate of change of speed?

Answer 8

Rate of change of speed = final speed - initial speed / time taken

Question 9

What is the equation for volume? (Not d=m/v)

Answer 9

V = l×w×h

Volume= length × width × height

Question 10

What is the equation for acceleration?

Answer 10

a = v-u/t

Acceleration= final velocity- initial velocity/time