Finlay's Equations Y10

Question 1

Pressure?

Answer 1

Force normal to a surface/ area of that surface

P = F/A

Question 2

Distance travelled?

Answer 2

Speed x time

S = v t

Question 3

Acceleration?

Answer 3

Change in velocity / time taken

a = v - u / t

Question 4

Wave speed?

Answer 4

Frequency x wavelength

V = f a

Question 5

Charge flow?

Answer 5

Current x time

Q = I t

Question 6

Potential difference?

Answer 6

Current x resistance

V = I R

Question 7

Power?

Potential difference x ?

Answer 7

Potential difference x current

P = V I

Question 8

Power?

Current² x ?

Answer 8

Current² x resistance

P = I²R

Question 9

Energy transferred? (1)

Answer 9

Charge flow x potential difference

E = Q V

Question 10

Density?

Answer 10

Mass / volume

rho = m/v

Question 11

Weight?

Answer 11

Mass x gravitational field strength

w = m g

Question 12

Work done?

Answer 12

Force x distance along the line of action of the force

W = Fs

Question 13

force applied to a spring?

Answer 13

spring constant x extension

F = k e

Question 14

Efficiency?

Answer 14

Useful output energy transfer /
total input energy transfer

Question 15

Kinetic energy?

Answer 15

1/2 x Mass x Speed²

Ek=1/2mv²

Question 16

Gravitational potential energy?

Answer 16

Mass x Gravitational field strength g x Height

Ep=mgh

Question 17

Moment of a force?

Answer 17

force x distance normal to direction of force

M = F x d

Question 18

Momentum?

Answer 18

Mass x Velocity

m = m x v

Question 19

resultant force?

Answer 19

mass x acceleration

F = ma

Question 20

power?

energy transferred/?

Answer 20

energy transferred/time

P = E/t

Question 21

power?

work done/?

Answer 21

work done/time

P = W/t

Question 22

efficiency?

Answer 22

useful power output/
total power output

Question 23

energy transferred? (2)

Answer 23

power x time

E = Pt