PAPER 2 EQUATIONS

Question 1

efficiency=

Answer 1

• useful energy output/ total energy input x100
• useful power output/ total power input x100

Question 2

moment of a force=

Answer 2

• force x distance (normal to direction of force)
• M=Fd

Question 3

pressure=

Answer 3

• force normal to a surface/ area of a surface
• p=F/A

Question 4

momentum=

Answer 4

• mass x velocity
• p=mv

Question 5

wave speed=

Answer 5

• frequency x wavelength
• v=fʎ

Question 6

resultant force=

Answer 6

• mass x acceleration
• F=ma

Question 7

weight=

Answer 7

• mass x gravitational field strength (g)
• W=mg

Question 8

force applied to a spring=

Answer 8

• extension x spring constant
• F=ek

Question 9

acceleration=

Answer 9

• change in velocity/ time taken
• a=△v/ t
• or a= (v-u)/t

Question 10

distance travelled=

Answer 10

• speed x time
• s=vt

Question 11

work done=

Answer 11

• force x distance moved (along the line of action of the force)
• W=Fs

Question 12

wave period

Answer 12

• T= 1/f
• f= frequency