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Machines & inclined planes Questions
1. (a) Distinguish energy from work
(b) A lady uses a ramp to lift 1500N load though a vertical distance of 10m. The ramp makes an
angle 30o to the horizontal. If the efficiency of the ramp is 75%:
(i) Calculate the V.R of the machine
(ii) Find the mechanical advantage
(iii) Find the effort needed to move the load up the ramp at constant velocity
Machines & inclined planes Answers
1. (a) – Energy is the ability to do work
– Work is done when a force applied on an object moves it through a certain distance
(b) (i) V.R = 1
sin
= 1
Sin 30o
= 1
0.5
= 2
M.A x V.R
= 75 x 2
= 150
(ii) Effort = Load
M.A
= 1500N
150
= 10N