1. Chapter No. 01 Simple Machines
Calculate Mechanical advantage, Velocity ratio and efficiency of various simple Machines.

2. Basic Concepts Load (W) Effort (P) Mechanical Advantage (M.A.) = =
Velocity Ratio (V.R.) =
Efficiency = x 100

3. Losses (Effort and Load)
Ideal Effort (Pi) =
Effort lost in friction (Pf) = P-Pi
Ideal Load (Wi) = PxV.R.
Load lost in friction (Wf ) = Wi - W

4. Law of Machine P = mW + C P = Effort required to lift load
Effort (P)
P = mW+C
Equation Of straight Line
P = mW + C
P = Effort required to lift load
m = slope of line
W = Load lifted by the machine
C = Effort required to start the Machine ᶿ C
Load (W)

5. Simple axle and Wheel
Velocity Ratio =

6. Differential Axle and Wheel
Velocity Ratio =

7. Single Purchase Crab Winch
Velocity Ratio =

8. Double Purchase Crab Winch
Velocity Ratio =

9. Worm and Worm-Wheel
Velocity Ratio =

10. Simple Screw Jack P
Velocity Ratio =