Simple machines questions | form two Physics

A lever which has its effort between the load and fulcrum is said to be the
A. second class lever.
B. third class lever.
C. first class lever.
D. fourth class lever.

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

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

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.

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

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

Figure 1 shows a simple machine B which has to be used to pull the packing case of 2000 N into the car by an effort of 500 N. Calculate the efficiency of machine B.

Match the properties or functions of the simple machines in List A with their corresponding names of the machines in List B by writing the letter of the correct response beside the corresponding item number in the answer booklet provided.

Figure 1 shows two simple machines A and B having the same efficiency. Justify that simple machine A requires minimum effort to raise a load of 5000N.