a$)$ What does the term "Self$-$energising" mean with reference to band brakes.

$(1$ mark$)$

b$)$ Is the brake below self$-$energising, justify your answer?

$(1$ mark$)$

c$)$ The band brake drum sketched below is connected to a flywheel $(1=15kg{m}^2)$ that

rotates at $450$ rpm $.$ Determine the force $($F$)$ required to stop the flywheel in $8$ turns

after application of the bake.

$(8$ marks$)$