Machine

Question 1

What is machine

Answer 1

Machine is an equipment that helps us overcome a load using a lesser effort.

Question 2

All of MA.

Answer 2

1) Ma is dependent on friction.
2) Ma is =load over effort.
Which equals output force over input force.

Question 3

Velocity ratio

5 formulas for every machine vr

Answer 3

1) Vr= distance moved by effort over distance moved by load.

2) Vr is dependent only on geometry of machine and not friction.
3) at incline plane, vr=1/sin@ or length over weight.

4) in wheel and axle, vr= radius of wheel over radius of axle. R/r.

5) in pulley and tackle, vr= number of pulleys.

Question 4

Efficiency

Answer 4

1) Ef= work done by machine, over work done on machine *100.

2) Ef= ma/vr *100

Note a perfect machine has ef 100
But normal machine don’t due to friction.