Slides in this set
work done = force x distance
W (J) = F (N) x s (m)
work done is the amount of energy transferred
from one form to another.
1 Joule = the work done when 1N of weight
When the direction of
movement is different to
the direction of the force...
W = Fs cos
The principle of conservation of energy states that
energy cannot be created or destroyed, only
Work done = energy transferred.…read more
Power & Efficiency
efficiency = (useful energy
output ÷ total energy input) ×
power = work done ÷
P(W) = W(J) ÷ t(s) Nothing is 100% efficient.
1 Watt = the rate of Efficiency can be shown in
energy transfer Sankey Diagrams
equal to 1 joule per
power = force x
P(W) = F(N) x v
Hooke's Law says the extension of a spring is
directionally proportional to load, as long as
the elastic limit has not been exceeded.
F = kx
Force (N) = spring constant (N/m) x extension (m).
Springs in series: K = k/n
Springs in parallel: K = kn…read more
Behaviour of Elastic Deformation
Springs and Material returns to original state.
·When material is put under
Materials tension, the atoms in the material
pulled apart from each other.
·Atoms can move a small distance
from their equilibrium positions
without changing the shape of the
·Once the load is removed, the
atoms return to their
Material is permanently stretched.
·This occurs after the elastic
limit is reached.
·Some atoms in the material move
Ultimate Tensile Stress is the position relative to each other.
max. stress the material can
·When load is removed, atoms don'
withstand. t return to equilibrium position.…read more