FORMULAS

Question 1

Weight

Answer 1

mass x gravitational field strength W=mg

Question 2

Work done

Answer 2

force x distance W = Fs

Question 3

Force applied to a spring

Answer 3

spring constant x extension F=ke

Question 4

moment of a force

Answer 4

force x distance M = Fd

Question 5

Pressure

Answer 5

force / area p= F/A

Question 6

distance

Answer 6

speed x time s= vt

Question 7

acceleration

Answer 7

change in velocity/ time
a = triangle v/ t

Question 8

Resulatant force

Answer 8

mass x acceleration F=ma

Question 9

momentum

Answer 9

mass x velocity p= m v

Question 10

kinetic energy

Answer 10

0.5 x mass x speed^2
0.5 mv^2

Question 11

gravitational potential energy

Answer 11

mass x gravitational field strength x height
Ep= mgh

Question 12

Efficiency 1

Answer 12

useful output energy transfer/ total input energy transfer

Question 13

Efficiency 2

Answer 13

useful power output/ total power input

Question 14

Wave speed

Answer 14

frequency x wavelength
v= f lamda

Question 15

charge flow

Answer 15

current x time
Q= I t

Question 16

Potential difference

Answer 16

current x resistance
V=IR

Question 17

Energy transferred

Answer 17

power x time
E= Pt

Question 18

Energy transferred

Answer 18

charge flow x potential difference
E= QV

Question 19

Density

Answer 19

mass / volume

Question 20

all 4 powers

Answer 20

energy transferred/ time
work done / time
potential difference x time
current^2 x resistance