physics end of year exam

1L=1dm cube density=mass/volume 1kg=10N

HOOKE'S LAW: F is the stretching force e is the extension and K is called the force constant: F=K x e

(moment of a force)Nm= (force)N x (perpendicular distance of the line of action of the force from the fulcrom)m LAW OF MOMENTS: clockwise moments = anticlockwise moments Mechanical Advantage (MA) = load/effort Velocity Ratio (VR) = distance moved by effort/distance moved by load

Pressure(Pa) = Force(N)/Area Pressure(Pa)=Weight(N)/Area unit of pressure is Pa <density of liquid= <pressure

work(J)=Force x Distance moved Power(W)=Work/Time taken KE=0.5 x m x Vsquared Gravitational potential energy(J)=mass x gravity(N/kg) x change in height(m) Elastic energy(J)=average force x distance gravity on earth=10

Absolute zero=coldest possible temperature= -273 degrees C= 0 K in kelvin scale Expansion=Linear expansivity x Original length x Temperature rise

Specific heat capacity(J/kg x degree C)=Heat required to produce 1 degree C rise in 1kg Heat received or given out=mass x temperature Q(J)=m(kg) x T(degree C) x c(J/kg x degree C)