Physics Momentum and work, Energy and Power test

Define Momentum

mass x velocity or p=mv

define impulse

force x change in time or impulse = F∆t= ∆(mv)

define resultant force

F= ∆p÷ ∆t, where ∆p is the change in momentum.

Name the 8 forms of energy

kinetic, thermal, chemical, electrostatic, nuclear, gravitational potential, elastic, magnetic

Principal of energy conservation

Energy cannot be created or destroyed, only transformed from one form to another.

kinetic energy

KE = 1/2 mv², where m is mass and v is velocity.

change in gravitational potential

∆GPE=mxgx∆h

mechanical or electrical work done is equal to …

the energy transferred

mechanical working

W=F x D = ∆E

% efficiency energy

(useful energy output)÷(total energy output) x 100

% efficiency power

(useful power output)÷(total power output) x 100

define power

p=W÷t or p=∆E÷t