PHYSICS 1.4 FORMULAE

Important knowledge for the upcoming exam.

What is the equation for power in mechanics?

power= work/time or p=w/t 

What is the equation for power in electricity?

power= voltage x current or p= v x i

What is the equation for kinetic energy?

Kinetic Energy= 0.5 x mass x velocity2 (squared) or EK= 1/2 x m x v2

What is the equation for gravitational potential energy?

gravitational potential energy= mass x gravity x height EGPE= mxgxh

What is the equation to calculate mass in mechanics?

Gravitational potential energy/ (height + gravity)= mass or EGPE/ (h+g)= m

What is the equation to calculate height in mechanics?

Height= Gravitational potential energy/ (mass+gravity) or EGPE/(m+g)= h

What is the equation to calculate velocity in mechanics?

Kinetic energy/0.5 x mass square rooted = v² or √EK/(0.5 x m) =v²

What is the formula to calculate force in mechanics?

Force= mass x acceleration or f=mxa or Force= work/ distance/ F=w/d

What is the formula to calculate work in mechanics?

Work= force x distance or w= fxd

What is the formula to calculate distance in mechanics?

Distance= work/ force or d=w/f

What is the formula to calculate the energy in specific heat capacity in thermal energy?

Energy=mass x specific heat capacity x change in temperature or Q=m x c x 𝝙t

What is the formula to calculate latent heat (state change) in thermal energy?

Energy= mass x specific/ latent heat or q= m x l

What is the formula to calculate specific heat capacity in thermal energy?

Specific heat capacity= energy/ mass x change in temperature or c=q/m x 𝝙t

What is the formula to calculate voltage in electricity?

v= e/c or v= i x r

What is the formula to calculate potential difference in electricity?

potential difference= energy transferred/ charge

What is the formula to calculate efficiency?

Efficiency= used energy/ total energy

What is the formula to calculate current in electricity? 

current= charge/ time or i= q/t or current= voltage/ resistance or i= v / r

What is the formula to calculate power in electricity?

power= voltage x current or p=v x i

What is the formula to calculate resistance in electricity?

resistance= voltage/ current or r=v / i

Are power and change in energy equal?

Yes, but not always

What is the formula to calculate the energy consumed?

energy consumed= power x time or wh= w x h

What is the formula to calculate the time to complete an action in electricity?

time= energy required/ energy in object

What is the formula to calculate change in energy?

change in energy= powerx𝝙time 𝝙e= px𝝙t

What is the formula to calculate change in gravitational potential energy in mechanics?

Change in gravitational potential energy= mass x gravity x change in height or 𝝙E_p= m x g x 𝝙h