Simple machines questions | form two Physics

a) A machine is _____
b) Briefly write the meaning of the following terms as used in Physics:
(i) Mechanical Advantage of a machine
(ii) Velocity Ratio of a Machine
(iii) Efficiency of a machine

Answer / Solution

UNSOLVED

If a pulley system as a Velocity Ratio of 5 and the Efficiency of the system is 80%, what is the Mechanical Advantage of the pulley system?
A. 5
B. 400
C. 40
D. 4

Answer / Solution

UNSOLVED

A machine with two pulley system and efficiency of 75% is used to lift a load of 120N through a distance of 0.5m. Calculate:
(i) Its mechanical advantage
(ii) The energy wasted by the machine.

Answer / Solution

UNSOLVED

Which of the following is an example of a third class lever?
A Scissors  B Fishing pole  C Pliers  D Nut cracker

Answer / Solution

B Fishing pole 

Staircases, winding roads uphill, wedges and a screw are physical examples of______

Answer / Solution

Staircases, winding roads uphill, wedges and a screw are physical examples of simple mashines