Work Package 2

Question 1

what is the calculation for velocity ratio: (given)

Answer 1

distance moved by the effort/ distance moved by the load

Question 2

what is the calculation for mechanical advantage: (given)

Answer 2

load/ effort (force produced divided by force exerted)

Question 3

what is the calculation for efficiency (%): (given)

Answer 3

(mechanical advantage/ velocity ratio) x100

Question 4

give three examples of simple machines:

Answer 4

1. bike (fixed gear bike)
2. tin opener
3. screw

Question 5

what is a VVR?

Answer 5

variable velocity ratio

Question 6

typically the variable velocity ratio is changed to do what?

Answer 6

so there is a greater mechanical advantage provided when most output force is required.

Question 7

with a VVR, when the input is moved at a constant velocity, what does this result in?

Answer 7

the output moves at a variable velocity and this results in a changing ratio of velocities and a changing mechanical advantage too. Usually, the output velocity decreases (and the mechanical advantage increases) as the system needs to exert greater output force.