Machines & inclined planes Questions And Answers (part 2)

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 30^o 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 30^o

= 1

0.5

= 2

M.A x V.R

= 75 x 2

= 150

 (ii) Effort = Load

M.A

= 1500N

150

= 10N