NiEG GCSE PIIYSICS (1700r 19Bg

' i! . ,-.r List of formulae for Paper l

The foilowing informatio n mq be useful.

I Densirv = -€. volwne

2 pressure= # p=+

3 Force =mass xacceleration F = ma

4 The sqength of the gravitational field at Earth's surface (g) can be taken as 10 nefions per kilogram.

Weight = nttrssx gravitationalfeldstrength W = mB

5 Relationships between initial velocity (rr), constant acceleration (a), final velociry (v), and distancetravelled (s) after time (r).

v-uc=' u+v

averagevelociry= -T

s = average velociry x rtme= (' +') ,

6 For a body of mass rn moving with velocity v

Kinetic energy = t1r7nv2

For a body of mass m raised through a height lr

Gravitational potential energy = mgh

8 lVork 6ons = force x dktance moved al.ong line of action of force

cnergy transformed work done, rower = ---ffi2ffi = Tme;e6Ten

l0 The eficiency of amachineor system= +^%ffiffi = ffiWll The moment of aforce about a pivot = farce x perpendicular distance fromforce n pivot-

12 Wave sp"ed = frequency x wavelength v = f)t

13 Etectriccwrent=W I=+

14 Resistance = pbrent\q!-4fl:ience R= +

15 Electric powsT = potential dffirence x curreit P = VI = IzR = #

16 Fo_r a transformer

Secondary voltag,e number of turns on secondary coil ys - .Ns-ffiaryno\iage = E-=-FF-

17 For a trarxformer with an efliciency of l00To VrI, = VOJO