Define the following terms as used in machines;
i) Mechanical advantage
ii) Velocity ratio (4marks)
b) state the law of conservation of energy (2marks)
c) In a machine, the load moves 2m when the effort moves 8m. If an effort of 20N is used to
raise a load of 60N, calculate the efficiency of the machine. (4marks)
d) A man uses an inclined plane to lift a 60kg load through a vertical height of 5metres. The
inclined plane makes an angle of 30 o with the horizontal. If the efficiency of the inclined
plane is 80%.calculate the
i) Effort needed to move the load up the inclined plane at a constant velocity.
ii) Work done against friction in raising the load through the height of 5 metres. (take
g=10N/kg)
